I already mentioned this, but the battery life probably hasn't gone done. When the released the new MBAs they used new, realistic benchmarks. 6 - 7 was realistic for the 2010 MBP. I know, it's what I'm typing this one.
Huh?
"If you’re a video editor, imagine connecting high-performance storage, a high-resolution display, and high-bit-rate video capture devices to handle all the post-production for a feature film — right on your notebook. Thunderbolt I/O technology allows you to daisy-chain up to six new peripherals, such as the Promise Pegasus RAID* or LaCie Little Big Disk,* or five peripherals and an Apple LED Cinema Display."
Unless I'm missing something, you can daisy chain to anything you can have an adapter go to. The monitor appears to just have to be the last item in the chain.
http://www.apple.com/thunderbolt/