Did you migrate your App`s & data or is it a clean install? Migration Assistant can cause some issues, and something I never touch on OS X. To me the early adopters are gong to have to sit and wait on Apple getting the power consumption of Sierra down.
I think that you can see 10 hours of runtime however only if you strictly mimic Apple`s testing, not average use. Previously Apple was always conservative on battery runtime, to me they are setting up the new MBP for Kabylake, not Skylake, yes CPU efficiency is improved, equally there is more hardware onboard; TB-3`s Alpine Ridge controller & the new Touch Bar. The new display may or may not be more efficient at 100% brightness, also faster SSD`s.
Might be interesting if not telling, if an owner with Windows 10 installed can look at power consumption with say Battery Bar Pro, then again with Coconut Battery in macOS, if there is a significant difference then likely a software fix will work. Just a thought...
Q-6
I never migrate. Clean install x 3