Sadly no unlock yet, the following is from the release noes
Functionality not in macOS 10.12 beta
Faces in the Photos app do not sync across your devices.
The ability for your Apple Watch to unlock your Mac is not in this seed.
Here is a link to the release notes, as if you are running Sierra beta, a few other things might be interesting to you (some nasty things might bite you, specifically with contacts+3rd part apps, notes folders re-appearing, SMB changes, VPN changes etc).
http://adcdownload.apple.com/WWDC_20...ease_Notes.pdf
For once I'm actually waiting a bit to see these things cleared up, as to be honest most of the space saving improvements & other features I wouldn't look to use with un-reliable (or more importantly un-supported) beta code. But that decision could change at any moment......because I'm a little crazy like that.