We're really not allowed, by the Terms of Use, to even speculate on unannounced products. However, we do know that new Mac Pros are coming in 2013 and, personally, I wouldn't expect to see any new Apple displays until then or even later.
If you need the Cinema Display (you've posted in the Thunderbolt Display forum), go for it. I'm sure that it will work just fine with any new Apple products that may be coming out in the next couple of years (and, if you've a Thunderbolt port on your Mac, go ahead and get the Thunderbolt Display - it has some docking advantages over the Cinema Display).
Clinton