I'd love to see a new body from Canon, crop or FF, that actually makes a measurable (by DxOmark) improvement in low ISO read noise. Canon's done great guns at improving higher ISO across the board from compacts to pro SLR
but they still lag grossly at low ISO shadow SNR - sure, it only affects a few of us to any significant extent, but I won't spend any of my money on another Canon body until they actually show some serious improvement in that area.
Nothing they've brought out in the last few (to 10) years has made any significant improvement in this area. So much so that not only will I not buy another Canon body until they improve, I've sold the more expensive newer ones that failed to deliver anything over the older bodies I already have. AF improvements, video and other features are nice but I'd just like a much improved stills shooter, please.
BTW, my favorite new under-puppy Pentax
might release a FF body this year, likely a conservative 24MP unit.
If it performs anything like their K5 series, their market share is likely to double! from darn near nuthing to twice that!
However, as an enthusiast camera maker, Pentax has a small but very loyal user/fan base, many of whom still own some FF compatible old film-era lenses so if they do release a reasonably priced (and they're as bad for this as Canon) new FF body, I can see some uptake from existing users who'd prefer not to go CaNikon to get FF goodness. count me in as one of those who'll be willing to give that new FF a whirl.