For me it feels no different at least in stand-by mode. I installes beta 6 after a fresh install and configured my phone to new device on 10.3.3 then update and I still lose 2% battery every 2 hours when in iOS 10.3.3 It lose +/-1% every 3-4 hours (not counting when I'm 100%).
For me it became worse. Didn't have any battery problems with previous (public) beta's. Now since i am on beta 6 its worse. On a normal day its just reading a few emails and checking social media now and then. I start using it more around 13:00 and 17:00. That is where it normally drops more but still make it through the day with at least 20% left. Today at 12:00 it already dropped by 40% and i haven't used it that much.
Yesterday i got the 20% warning already at 17:00. I charged it to around 70% and at 23:00 it had dropped to 10%. But i haven't used it more than i usually do on a normal day, and didn't experienced this on the previous beta's.
There is few settings in iOS 11 which is enabled by default and if you don't use it or had it enable in iOS 10 , it is gonna drain some battery.
1. Mail is set to fetch automatically ( if you had manual before than change it)
2. Privacy -> Share Analytics is on ( turn it off if you don't want to share, but i normally keep it on for beta)
3. Setting -> Date/time is set to Automatically
4. Apple music is on by default.
I am getting much better battery on this beta ( even better than iOS 10.3.3 , 7 +)