I have a Defy AP 1 on order and should have my hands on it in a week or two.
The carbon wheels was one of the primary reasons I held out for the '17 instead of going for a leftover '16.
As to size I like the room and assumed it could take much bigger than 25's. I have 25's on my current ride and like them. I'll decide at the time but there's a good chance I'd put 28's on the Defy when the 25's wear out.