At first, VoLTE will be used to deliver "Rich Communications Services" (which look like something similar to what Voice over IP/Video over IP outfits offer today) rather than completely replacing narrowband voice. It will be awhile before Verizon is willing to commit to that, due in part to LTE outages in late 2011.
On the flip side is MetroPC, which has pushed VoLTE as hard as it could.
Then there's Sprint, which will stick to voice over 1x for the foreseeable future, but routes Direct Connect over IP. Sprint's latest DC incarnation seems quite similar to one facet of RCS over LTE.
Band 2 5x5 is standard across the city. And usually you can find CA with either band 12 5x5 or band 71 10x10. I dont know if band 71 has always been 10x10 or if its because of that leasing deal with dish. I just got back 2 days ago so I haven't been able to test the network before the lease with dish. The coverage is actually very decent. My job has me driving all over the city all day and I always have a strong signal. The speed is just awful. Its encouraging that the signal is good because all they need now is some more bandwidth/capacity and they'll be good to go.