Apple is reportedly working on a software update for iOS that'll addressed widely-reported battery concerns. Here's a statement from an Apple exec to All Things D's Ina Fried:
A small number of customers have reported lower than expected battery life on iOS 5 devices … we have found a few bugs that are affecting battery life and we will release a software update to address those in a few weeks.
Apple iOS 5.0.1 will add some other bug fixes and little adds for iPad support. Stay tuned.