Holy fuuuuuuuuuuuuuuuuuuuuu-
is what I'd like to say. I first caught it in this thread.
http://www.pojo.biz/board/showthread.php?t=929218
Then to an OCG blog I follow (those guys know japanese so I trust that one more).
Here is the link to the original source http://yugioh.faq.konami.jp/EokpControl?&lang=en&event=IE0004&wid=60796&target=faq all of you japanese readers can confirm [/sarcasm]
Now if you follow the pojo link it has a translated text.
It basicaly says there is a rule change with that weird priority to activate ignition effects, which you got on summon. Now, upon the successful summon of a monster (either an inherent summon or if the summon was the last thing to happen in a chain) the turn player has priority to activate not only a spell speed 2 or higher effect in response but also the ignition effect of a monster. It is what allows you to tribute Exiled Force before it is hit by Trap Hole, what allows you to activate the effect of Brionac before your opponent responds to the summon with Bottomless Trap Hole, it is what made Lonefire Blossom dodge Effect Veiler etc. in case you don't understand. The change is of course that this will no longer exist, upon the successful summon of a monster you will have priority to activate a spell speed 2 or higher effect and that's it.

NOOOOOOOOOOO my chaos plants!!!!- Wait a second, my main deck irl is Machina, what do I have to worry about. Don't forget people, trigger=/=ignition, trigger effects do not need your priority to activate, so they will still activate on summon as normal, so before you come up with stupid wrong assumptions, Monarchs still work and the entire Machina deck (except from my gale, but I got Birdman so I don't care) is intact. Wait, actually I never even summon Tytannial, what do I care about priority to activate the effect of my lonefire in the first place.

What is the impact of this? Think about the meta game and how many monsters there have ignition effects which you activate using your turn player priority. Not even Rescue Cat is as threatening as it used to be, since now you just need to hit it with one of your chainables before the effect activates and you are good. So it means you will see a rise in chainables, the return of Bottomless Trap Hole in 2s in every deck, you will see a drop in cards which negate summons, maybe the return of Trap Hole, you could see Brionac hitting the semi-limited list and generally some changes in the banlist among others. This could be the reason Book Of Moon was hit, because in this case it does become a truly broken card.

How much of this is true? I don't know, that is indeed the Konami page it seems, the translation seems to be supported by ocg blogs, it wasn't doubted in the pojo thread, but being the overly suspicious person I am, I am still going to hold a little doubt, in case the translation isn't accurate. It could be that this is happening to make the game easier to understand (as much as I was accustomed to it, and as much as I will defend any and all established rules and try to find the sense in them, there was this rule you could activate a specific kind of spell speed 1 effect along with the generic spell speed 2 or 3 so long as you were responding to a summon, so it was still weird mechanic-wise) for new players, or it is made more children-friendly (you saw that new yugioh manga, right?). Now as to when it will get to the TCG. In the OCG it will hit on March 19, with the release of the new structure deck. That means that it could hit the TCG:
1. At the same time
2. At some random point in the future
3. Never or at some completely random point in the faraway future when we are much older...

What happens we will see. But if it does, bring out your chainables people, get those raigeki breaks/phoenix wing wind blasts, those compulsory evacuation devices, those Enemy controllers, keep a couple of Trap Holes at the ready and all those stuff.

Why would the semilimit Warning if this was going to happen.
It's huge, in fact I'm not believing it til I read official news (TCG ofc).
So this is the way they're trying to promote Excess summoning...lol

By now it's pretty much confirmed. I mean if ness says so...
Anyways, if you think about it a bit it doesn't affect the game as much this format. If it was a couple of formats ago then yeah, the rescue cat, substitoad, dad, ls etc. formats would be a lot different, but in this one maybe infernities will get hit (mirage) and maybe lonefire (by veiler). Scrap dragons won't be hitting stuff with priority, and no more brio bouncing before getting bottomless. Heck, you play glads and machina, those along with monarchs are the least affected, I mean yeah, you don't have priority with test tiger anymore, but even before if they chained something to hit the GB test tiger wouldn't do anything anyways.
Wait a second... OOOOoooooooohhhh, you play beasts lol

I'll not be able to summon Moja with striker before bottomless D:

Meh...seems Konami wants to encourage little Kids to learn the rules.

The hell 0.O

that was my first response

anyways it will be fun to see how things turn out now although I do feel sorry for lonefire T.T

now with there being a big differance between trigger and ignition this game will become even more confusing xD

There was always a big difference guys... that's why we were always saying "You don't use priority to activate a trigger effect" but alas, no one would listen and now everyone is making wrong assumptions... anyways, update

Kevin Tewart wrote:

We are not making any changes to the TCG mechanics at this time. When/if we do, we will document them extensively with examples and full details for everyone to read. Cuz that's how we roll.

link http://www.facebook.com/topic.php?uid=248499755248&topic=17814
well, we already knew that this would generally be the answer from konami officials but let's quote for proof before people start making more assumptions.

wat happen to the exceed material when the excess monster died/fliped and such?
did you search if you use sangan as excess material?

http://shriek.twoday.net/stories/14644214/
The exceed materials are overlayed beneath the monster. When you use them for the effect however they are not considered to be sent to the graveyard, so you don't get sangan's effect. I think I fail to see the trouble or how this relates to exceed monsters though...