Well it depends on what you mean I prospects I guess. If you're talking guys who are yet to play an NHL game, then there's a handful in the Rangers organization who could have a chance of playing some in the NHL this season.
Chiefly amongst them would be Dwight Helminen who is probably destined to start in the AHL, but with the current lack of depth at center for the Rangers, there's a good chance he could see some significant ice time during the season. Ryan Hollweg probably also has a reasonable shot at some 3rd/4th line duty.
David Liffiton might also get some time on defense, but the Rangers do have a lot of young defensemen that he would have to outplay...same goes for Jake Taylor, although I'm not sure he'll even be able to cement a spot in Hartford to start the year.
Alexandre Giroux may get a look simply because there's such a lack of depth in the organization on the wings.
Rookies who are likely to either make the NHL roster or get ice time include (in no particular order): Thomas Pock, Maxim Kondratiev, Fedor Tyutin, Lawrence Nycholat, Martin Grenier and Bryce Lampman on defense...Garth Murray, Jozef Balej, Mike Green (if he gets signed), Dominic Moore and Chad Wiseman. Goaltending should include a few games for Labarbera if they continue with the roster as is.
There's some speculation (press or otherwise) over the potential of signing Nate Guenin or Marcus Jonasen to pro contracts too, though with the signing of Taylor, I'm not sure how serious they would be about bringing Guenin into an overloaded position.
Layne Ulmer might also get a game or two here and there.
Ultimately there are few players outside of Pock, Tyutin, Balej and perhaps Kondratiev and Moore who are expected to make much of an impact out of that bunch.