Let's see if the big scoop is a Pokemon MMORPG on the Wii U.
My guesses:
R/S remakes in full 3d like x and y and have gen 6 pokemon, and revealed that most evolutions to past pokemon are frome hoenn
x and y can be made into a full fledged MMO.
A bunch of new pokemon, maybe a legend or 2 like mewtwo's other forms
A completely new and shocking pokemon game on wii u that would blow our minds.
They WILL NOT announce another "Major Titled" game. Why? Why would they announce another game when the game they are currently marketing ISN'T OUT YET? Guys, seriously common sense. This isn't even something you NEED experience in to understand. They are currently marketing a Major Pokemon Title to release in 2 months world wide. Why in god's green earth would they start marketing another game when they have NOT released their currently marketed game yet?
We will not see any new major titles for up to a year or two after the release of the current one. There will be no Remake information for another TWO YEARS people. This is not just to the two quoted because others have said this, there is a whole new thread about remakes in PGC. They will not release information about another major game for a while.
On a lighter note;
If its a Wii U game, it won't be from Gamefreak. It'll be someone else, but with the 3DS' technology the need for a 3D Wii U battle game is pretty much non-existent. Chances of a new Stadium or PBR are fairly low. Colosseum or XD have a slightly higher chance, but something like these most likely won't even be shown for another 6 months to give X and Y proper sell time.
A bit of negative, keep in mind CoroCoro is for Japanese Readers. This could be a new store, merchandise or even a theme park as well. I don't remember them saying anything specific towards Pokemon. I've asked a friend to look over the scans that he has, cause the last time with the Serebii translation error my friend told me that what the Serebii translator had said didn't exist. He'll tell me if he sees anything out of the ordinary this time, but I haven't heard back yet. From what I remember he said there wasn't a specific target, only that it was pokemon related, but Pokemon encompass more than just the games, the Anime, TCG, as well as real world locations are possible to be effected and a real world change locally would be a scoop of a century on scale for Japan.
Chances of a new or another game are pretty much 0.
Chances its X and Y related are pretty good, but personally, as I stated earlier in another post, its most likely about Mewtwo who hasn't been updated yet despite his movie being out already.
Chances of it being related to the TCG, a real world Location, or the Anime are all about equal and about as high as the video games' possibility.
There are many rumors still floating around and I have my doubts that they are related to this news update.
There is another possibility as well that my brother just let out as a snide remark, there is a possibility that the older games can be released onto the 3DS Market if its international related. Since there really hasn't been any sort of update State wide on Pokemon.com or any of the other non-japanese Pokemon websites, chances that this "Biggest scoop of the century" are local to Japan only are actually pretty good. If its supposed to be a large scale announcement it would have been promoted internationally.