One of the guys on the other RZR site posted a GoPro video several months back, as he was riding his dirt bike out in the Parker / Havasu area. He said he see's the Polaris guys out there testing all the time. He caught a prototype RZR and by looking at a still shot of the UTV it looks very much like the preview picture we are shown.
My guess is this video/picture I saw is this new machine with refined plastics, and in regards to power I would would bet it will be the H.O 900 engine. Polaris has not issued a new engine with CARB. And the H.O is new for Polaris and is only offered on the Jagged X as of now. That added power and possibly an improved clutch would be a big improvement alone. There would be no need to develop a new bigger CC'ed engine.
And like myself and others have said, they will not build something over 1,000 CC. They did not spend allot of money supporting AB1595 just to trump the law they wanted passed.
Edit! Oops I was wrong! They look to be releasing a 1000CC or close to it engine. I did not see it listed with CARB. If you want to see a picture before it goes away you might want to check out the RZR site. I'm guessing Polaris is going to be pissed at the leak! Looks like a a Wild Cat!