The Warhammer Community site has a Faction Focus Index, though not all of them are up yet.

They have also done a preview of the whole 3 Ways to Play thing...which I still don't really the get the need for but there we go.

Oh yeah the Tyranid Faction Focus is up now too.

It would have been cool if GW had taken this opportunity, with the Kill Team boxed game, to fill in some missing plastics...maybe Kommandoz vs Eldar Rangers or Lictors.