2009 MBP averaged 6-7 hours and now getting 3-5 depending on video watching.
I def think there is a drain with this version, i've seen a battery drop of like 30 percent. Was just 28 percent, and did some browsing at half brightness, and 10 min later I am at 17 percent. I think I tweeted 3 times, wrote 1 email, and read 2 articles...it just seems to have iPhone like battery drain...