Which is a spin-off by HAL, and Game Freak has next to nothing to do with the majority of spin-offs.
But they still decide what games to make, don't they? They can decide to hire a developer to make a spinoff game or decide not to. They don't make the spinoff games, but as the copyright holder, they choose what games are released, don't they?
So with such hyped information as this, is it safe to assume that the announcement involves the main series games, more notably the anticipated "Pokemon Gray" or RSE remakes?
It's obviously going to be Gray. This is right time for a third version according to GF's past behavior. Game Freak is a creature of habit. And the fact that a Kyurem movie is coming out this summer is pretty big clue. It's obvious Kyurem will be the star of the third version, and they're going to want to release this Kyurem movie to promote it. Same with the Rayquaza movie (around Emerald's time) and the Giratina movie (around Platinum's time.) Release the movie, get people excited about Rayquaza/Giratina/Kyurem, so hype for Emerald/Platinum/Gray builds.
Let's see what we have here:
-Masuda said it's related to a main series game (didn't he?)
-Kyurem movie this summer
-Fits GF's past release strategy.
Everything fits. There is no way this isn't the Gray announcement.
Oh, and interestingly, each of these "third version movie" also starred one of the 'secret' Pokemon. Deoxys, Shaymin, and Keldeo.
I would have thought the Gray announcement would be in April/May, since that's usually what they do. It surprises me that they're announcing it this early. Maybe they want to release it earlier than the standard September.
EDIT: In case anyone's wondering, it will be spelled Gr
ay, not Gr
ey. Game Freak regularly registers a lot of domain names (most don't ever get used). Pokemongray.com is parked by Melbourne IT, who has held domains for them in the past. They didn't even register pokemongrey.com.