Actually I could see versus xiii on the cover since it is supposed to be more action oriented and it was featured in either the current issue of famitsu or last months so maybe its time for a north american feature.
Like I said, Final Fantasy is not even close to the kind of game Game Informer puts on it's covers. Go on their website, browse the cover gallery, and note that there have been absolutely no JRPG covers since February 2007 with Blue Dragon, and no western RPG covers since Dragon Age in November 2008, Alpha Protocol in April 2008, Fallout 3 in July 2007 and Oblivion way back in October 2004. Fable in 2003 too, but that's as far back as I feel like going atm. As you can see Game Informer only puts RPGs on the cover extremely rarely, and JRPGs on the cover almost never. Final Fantasy anything being on the cover is incredibly far-fetched, when looking at those facts.
Edit: Final Fantasy X was on the cover in 2002, 8 years ago. Game Informer has changed quite a bit since then, however. It still seems extremely unlikely they will have a Final Fantasy cover in 2010.
Oh and the 3ds starfox is just a remake I believe of starfox 64 not a brand new entry in the series so...
It was still at E3. Not that I would even consider Starfox fantasy, what with the sci-fi vehicles...