There have been more hints about Resident Evil 6 through a Linkedln profile of CG Artist. The Artist in question is, Shannon Justison who revealed that she has worked in Resident Evil 6. You can check the listing here. The information states that the game was in development for a long time, as she revealed that she worked on the game since July 2009.
Justiston has worked on two films called Thor and The Smurfs and works for a L.A based company called Third Floor Inc. The game might be revealed at GamesCom.