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Yes. Apple completely changed battery designs between the removable and the non-removable versions. The latter will last significantly longer.

Here's a video from Apple with a fantastic overview of the new tech:

http://www.apple.com/macbookpro/overlays/battery-video.html#...

I think they switched from a Lithium Ion battery to a Lithium Polymer battery. The latter performs much better and lasts a lot longer. Most new cell phones, and incidentally, RC Helicopters use this too.

based on your figures, hell yes. I know three people with the unibody 15" MBP, and all get 6+ hours life