I would be interested in this if it is lighter than the 5d classic, and a bit smaller.
I really want something a little lighter with a built-in flash, but I'm not willing to give up the large viewfinder and nice image quality of full frame. I also really want video mode, auto ISO in PASM modes, and some wireless transfer built-in would be nice, perhaps with an ftp link run on Android on the backscreen.
I also want a small lens e.g. better 35mm f2 to go with it. As in, USM AF, and better screen coating. While you're at it Canon, how about a non-branded strap to go with my camera so I'm not a walking advert? Canon colours are fine, but I don't want your logo on my shoulder.
I really hope Canon delivers on the cheaper, more useable full frame camera front, because I am unhappy with the level of technology in cameras at the moment relative to smartphones for example, where you can take pics and video then wirelessly transfer everything to the PC (or wherever) when you feel like it.
I do not expect to have to pay extra for wireless functionality in 2012. This should be the price of admission to market these days, not a selling point!
Also while I don't expect every trinket from the 5D3, the AF needs a serious boost, just to compete with 2012 competition e.g. micro four thirds.
Canon is no longer competing with just standard DSLRs in this category anymore, but also with M43 and Fuji x100 etc.