I had a significant issue with one of my lines and eventually spoke to someone "higher up" in Accounts (for what that's worth).
He didn't want to directly answer my questions, but indirectly, I was able to get out of him that NV upgrades were supposed to start Q3 and be significant Q4, and LTE was supposed to be turned on Q1'13.
Again, take it with a grain of salt, as anything is subject to change.
As my data is as bad as everyone's else here in PHX (less than 0.2 down), it will be a welcome improvement.