Before anyone had danced a step, I went with Will and Karen, as I suspect Will has the fanbase to carry him through, along with a more than adequate level of dance ability. I've watched the group dance, and Ore is seriously impressive! Great moves, and he managed to be highly charismatic and watchable in the middle of a 30-odd person scrum!
Robert Rinder is hilarious to watch, as is Tameka, and both seem to be able to move as well! It's just way, way too early to call it - week 1 should give us a decent idea, and I suspect (as in most years) that I'll be able to accurately predict the top 3 or 4 by week 2!