Took a test ride on a 2017 last week to compare it to my 2016 CVO. Biggest impression is the lack of mechanical engine noise and smooth idle - definitely an improvement. Power, however, was about the same as my 110 (my 110 was dynoed after an exhaust change, so I'm getting a little more oomph there). No change in temperature - my 2016 is a cool running motor, far cooler than my 2008 CVO was. Oddly enough, the cooling fans ran on the 2017 where my 2016 fans rarely ever run.
Suspension felt no different and handling was the same feel as my 2016.
My biggest concern is HD's record for having problems with the first year motors. EVOs had leaky cylinder base gaskets, Twinkies had cam bearing failures, the 110s had head gasket issues in the 2007 model year. So, I'm staying away from them till at least 2018. At besides, I have a 2016 that has had zero problems in its first 9000 miles. And, I don't care for the colors on the 2017s.