I'm not 100% sure when/if the newest version will be ready. It would be best to go direct to Nuetech for new product info. The more direct request from customers can help let them know there is still interest.
The 950 SE also uses the 2.5" rear rim. If I recall from a few seasons ago we had some riders run them on those rims, but you need to check the side wall bead thickness of the tire you are running in order for it to seal tight. Not all tires have the same bead thickness.
I think the Tereflex and the 908 RR worked, but don't quote me on that. Nuetech should have more info on that also and what they might recommend.
I have not used this setup on an 2.5" rim so I don't have any personal experience, just going off memory.
Sorry I couldn't be more help at this time. I'll update this as I get more info.