I own a 60D and I actually prefer the 60D buttons (those beside the top LCD) compare to 7D buttons. One button, one function... clean and simple.
Some people or companies think that computer mice with two buttons confuse people - for me I'd like more functions to be available next to the lcd, but it's hardly essential for me.
The thing I really like about the 60d layout is that I can do nearly everything with the right hand, and I'm ok with the multicontroller (I have never used a joystick camera body) - so if the 6d builds on this Rebel-type layout it might not be pr0 but it seems to work for a lot of people, including me.
Got a little bit of a hard time when I used my friends' 60D in a party but I'd say it's not that hard to get used to it. After around 30 mins, I got the hang of it. True, it's easy to control it with one hand just like my 500D and that's what I'm looking for when I get my first FF camera. I've used 5D2 but coming from 500D controls, I'd say it's a little bit harder for me to get accustomed to it since you need both of your hands.