Not a lot of solid information on XDA about battery life right now, a couple people have stated they are having very poor battery life, but most of the people who did the OTA update likely had to roll back to 1.26 before flashing(not to mention, most of the members rolled to a pudding build before the OTA even hit).
I have an OTA build phone here and have had it going for a couple of days. You will need to retrain your battery after updating, it's all messed up until you do. First day getting all my apps back and everything configured I only got a bit over 10 hours on a charge(that was with nigh constant useage and also before training). Right now I have 7 hours since unplugged sitting at 90% battery life with light useage. Seems comparable, maybe a bit better, then the 1.83 build. I have one of the launch phones which seem to have considerably better battery life then the newer ones for some reason(one of the guys that work for me picked one up and his battery is significantly weaker then the other three people that have the Atrix on my team, myself included).