yeah its up to date. They have rolled out at least a couple of updates that supposedly fixed the 4g issues on the Bionic, but they were aimed at fixing the data connection issues of 4g inexplicably dropping to 3g while in a 4g covered area, or not connecting to 4g at all. When I first got the phone last fall it wouldn't connect to 4g at all and I had to convince verizon to send me a new Bionic and it worked ever since. Now its just the problem of some individual sites, including the nexus, not working on 4g.
I'm not too worried about it; its just a minor inconvenience and always wondered if anyone else had the same problem. Like a1pha said, I can just keep it on 3g sometimes for reliability and it saves some battery.