We're creating excitement, and that's gonna be money in the bank for them, eventually.
As far as the Build is concerned, it's not much to brag about, yet; it is, however, somewhat educational to learn how to sync and set up your system and content, then learn to teach 'Cortana' to recognize commands associated with your system and content.
It appears to work the same as in OPTION TWO below for me in Windows 10. build 9879
Windows Phone App - Sync with your PC
Did the Feedback App get a UI overhaul in all Builds?
Well I don't see any comments about the issues I'm running into (e.g. Nvidia Drivers on X99 Motherboard). Looks like I'll look for the Consumer Preview for a fix.
Maybe they're going to ditch header/border colors altogether.
I hope they aren't planning to introduce stupid disembodied menus (used on OSX and Ubuntu).