Canon is the one company that you truly NEVER know what they are up to. Sony, Nikon, Panasonic all tend to let their customers know well in advance when something is coming.
With Canon's poor release record in the last few years, I doubt they are going to release anything soon. They missed the 3 year Digic 4 1D update which was September of 2010 (8 months ago!) Digic 4 came out in 2007!!!!! I would think that the 5D3 would follow a 1D release, since that is their flagship camera, so who knows when the 5D3 will come. They did not release any significant bodies in 2010, just cameras that were simple firmware updates. Canon has become a company content on releasing cameras that are basically firmware updates (60d, t2i, t3i) and not releasing anything that addresses any real issues (like the dreaded moire problem on video).
So yeah, don't count on anything. It's not looking like they will release anything important once again in 2011.
I just wish they would do some type of video camera or DSLR video fix. That's all I ask for.
My advice is DON'T buy anything from Canon unless you really need it. The slower the business is for them, the sooner we will get the 5D3. If everyone just keeps buying the current, dated cameras, they will just keep milking it for ever.
I'm waiting for an EOS adapter for the Sony Video cameras, then I might jump ship. Could jump to Panasonic since the EOS adapter is coming very soon, but I don't like their camera offerings with the 2x crop.