Default [q] moto g verizon

Hello,

I am on AT&T carrier using on HTC ONE X and I am looking forward to buy Verizon MOTO G prepaid no contract phone @ BestBuy as it is on sale for $100. I was wondering whether it will work on my AT&T carrier or not as I am on 2 year contract.

And if I unlocked it, can I still get the android updates.

HELP!!!