Here is my prediction. I'll also post some renderings below my prediction list, of what I think the new XP 900 60" and 64" will look like. I left the XP 1000 behind the rendering, to show the comparison in scale.
Here is my prediction:
2015 ACE ProStar 32 (same as 2014 model)
2015 ACE ProStar 570 (new, with EPS, will now be 50-55 hp)
2015 RZR ProStar 570 (50" width, maybe new plastic design, and now with 50-55 hp)
2015 RZR ProStar XP 900 Trail (new, 60" width, replacing the RZR S 800, LED headlights and taillights, with new exterior and cabin/dash plastic design based off of the styling of the XP1K with XP1K seats, with an upgraded Prostar 900 with 90 hp and updated suspension)
2015 RZR ProStar XP 900 (64" width, LED headlights and taillights, with new exterior and cabin/dash plastic design based off of the styling of the XP1K with XP1K seats, with an upgraded Prostar 900 with 90 hp and updated suspension)
2015 RZR ProStar XP4 900 (64" width, LED headlights and taillights, with new exterior and cabin/dash plastic design based off of the styling of the XP1K with XP1K seats, with an upgraded Prostar 900 with 90 hp and updated suspension)
2015 RZR ProStar XP 1000 (same as current 2014, with lower rear radius rod fix)
2015 RZR ProStar XP4 1000 (same as current 2014, with lower rear radius rod fix)
AND all Limited Edition RZRs will have EPS.
AND now, here are the renderings as I mentioned:
The RZR XP 900 60" Trail and the 64" width.