I read that users (actual users) of the new Dell XPS 13 inch are getting "up to" 14 hours normal usage from it, probably owing to the new generation processor on it. That laptop goes up to 16GB too. Waiting on the 15 inch version to upgrade its processor then I'm jumping for it I think. My friends who bought the MacBook pro 15 in also experienced short battery life in some circumstances that didn't seem to be a problem earlier.Thank God they didn't put 32 gigs of ram on those babies. Like they said, 16 is for our own good and great battery life...
Put it this way. I don't expect batteries to last long if I am doing intensive work, but when on a long trip I want to get a good 10 hours of usage with light browsing in an airport etc. That should be reasonable to expect of a 'pro' device.