I think 1000 may have the best chance of coming once the 800 is gone.
that may be next year though.
If i had to guess next year we'll see
a new 900 Sportsman to replace the 800 in the Value Lineup.
a new 900 Big Boss, see above.
the end of the 800 HO, 800 Crew and 800 RZR
a new 900 Ranger 6x6 to replace 800 Ranger 6x6 "i'm surprised this didn't come out this year"
maybe a new special edition RZR 1000 or something... now that RZR is 1cc below the Legal barrier, as well as now having a Crew model I don't really know what's left for RZR short of a 570 Crew and special editions.
maybe we'll get more details on that Slingshot concept