I've made a short list and just need to wait for the right body now. I'm guessing it might be the 7DII, but I don't know. Here's my list of wanted features.
I do a fair bit of wildlife, in pretty awful light sometimes, and find pop up flash both convenient and useful. When you're in the water on a bad light day, in a rocky cove, struggling to keep your feet in the surf, having a hold up flash in one hand is just not feasible. Pop up flash works for me. As an example, here's a picture I took on Saturday, using pop up flash. Without the flash, there would have been no picture.http://sutherlandphotographiclibrary.files.wordpress.com/2011/11/2582-sealpupmakingfriends.jpg?w=900&h=494
Another thing I'm going to need is excellent noise control.
Another thing I'm going to insist on is the in-camera multi exposure feature, newly announced in the 1DX.
The last feature I'd like is a 60D type of flip screen. When I'm shooting seals in the water, I have to hold the camera just above the waves, so having a screen to see what I'm looking at, so I don't have to guess about framing and focus, would be fantastic.
As for pixels, well, 15 - 20 megapixels would do me. Sure, 100 megapixel cameras would make cropping decent images easy, but where's the fun in sitting in a car and shooting a deer on a distant hilltop and cropping a 10 megapixel image from it? Wildlife photography is about getting close to nature, and that's an art in itself, something no camera can do for you, and besides, that's where all the fun and satisfaction lies.
I wonder which next gen EOS body is going to be the one!