3.1 bug fix includes fixing that pesky jailbreaking / unlocking bug
I'm sure at this early in the game there is little to see in the beta's. Most of the things they push in the early beta's is the new API's in the SDK. Then towards the end we see more features. I'm pretty happy with 3.0 right now so I think I'll pass on 3.1 until I see so more about it and how buggy is may or may not be.