Saw my new Uforce 600 at the dealership today.  Still awaiting a rear window.  Didn't want to bring it home, and then take it back in a few days.
The noticed changes are 26" tires and side mount mirrors.
Ordered a service manual, bought oil filters and an o-ring to have "better to have and not need".  Already have a Uni and some other things. 
Going to drive me crazy waiting for the snow to melt to the point where I can start "break-in".  Just have to spend time checking bolts and figuring out what other stuff goodies I may want to in the future.  Will attempt to post pics when I get it home.

[2015 Z Force 800 53/Trail EPS]

Patience is tough..especially when you have seen it already...

Brought it home.  Still waiting on rear window, dealer said approximately two weeks. 
Max hp is 6750 rpm which I assume is max rpm.  Half throttle would be 3375 rpm and that makes for a very tight band above 2500 rpm which seemed to be lockup rpm.  Gas pedal seems to take a lot of getting used to in order to maintain any kind of constant rpm.  Thinking maybe a 2x6 mounted in front of pedal may allow better control of pedal as my foot would be at a more normal angle.

I'm not sure how the OEM rear window is mounted (I cut my own)  but if it rattles, as some have said, you can  cut down some bolts and secure the window to the holes in the headrests.