I've read a few posts noting multiple bodies this year. So, what if the 5D3 (if that is what the OP specifically asked about) is the monster megapixel camera? A lot of people seem to think that spec camera will be due later in the year - and that was then honestly confirmed by the Canon Rep.
And that could mean the spec and rumour we currently have (02 Mar 2012, 22MP, 61pt pro-like AF, $3500, etc) could be the elusive/evasive 3D or 5DX??? May explain product placement too after merging the 1D line.
Maybe I'm dreaming and delirious from following all these threads the last few days & nights. Is it Friday yet......?