It's tough to decode everything going on with Pokémon right now. The anime is stalling for time with a Team Plasma arc. No upcoming game is currently officially known to be in development. GameFreak says the series will "evolve" in 2013, but will it be a meaningful evolution? IGN noted that "Recent Pokemon announcements [...] came directly from Nintendo rather than through The Pokemon Company itself."
Black and White 2 having come out barely six months ago in Japan, it seems entirely too soon for 6th Gen to be ramping up. It is certain that there are multiple Pokémon games currently in development. If any is to be announced in the next few months, my bets are on a 5th-Gen battle sim (analogous to Stadium, Stadium 2, Battle Revolution, etc.) for Wii U.
The series' Japanese release history supports this theory:
Red & Blue -- 1996
Yellow -- 1998
Stadium -- 1999
Gold & Silver -- 1999
Crystal -- 2000
Stadium 2 -- 2000 (same day as Crystal)
Ruby & Sapphire -- 2002
Colosseum -- 2003
FireRed & LeafGreen -- 2004
Emerald -- 2004
XD -- 2005
Diamond & Pearl -- 2006
Battle Revolution -- 2006
Platinum -- 2008
HearGold & SoulSilver -- 2009
Black & White -- 2010
Black 2 & White 2 -- 2012
If a 5th-gen battle sim is coming, it's coming soon. If 3rd-gen remakes are coming, they're coming soon. And 6th gen will follow soon after both. Either way, given IGN's observation, I don't think January 8 is the day we learn about any of those things -- but if it is one, again, I'm betting on the battle sim.
