This is pure speculation, but there is a major change in the cam chest area, from the pictures I have the cover is a completely different shape. Looks more rounded like a frying pan. It's hard to tell by the pic, but the pushrods appear that they could be straighter which would lead me to believe a possible 4 cam build, or even a 3 cam (independent exhaust and shared intake cams).
I can say for certain that there is a re-designed horn cover lol
That is the ice breaker for me, I'm all in, now!
I've noticed how BMW is developing a bagger version (101 concept) and Harley is now going to a possibly 4 valve, 4 cyclinder bagger, as if there is a convergence or industry change of what a future bagger will look like and perform like. Each trying to entice bikers from either camp.
Based on Vrod sales, I'm certain Harley is sweating bullets over how this new bike will be received (here).