2. Still holds after multiple relaunches. Strange.
3. Cool. Looking forward to it!
4. I guess my system is causing multiple GUI bugs to present. I don't see a blue highlight when I mouse-over thumbnails.
10. Oh, I'm a dope. I even referenced the traffic light controls earlier in the comment. It somehow sailed over my head that the thing I was asking for was right there. Just tried it and it worked. However, I closed the only open window for an app and that thumbnail remained after the window was gone and the app had exited. That doesn't seem correct to me. But yes it's implemented and I got stupid for a moment while poking around.
One other thing that I noticed after exiting the app was that all the windows that had been minimized to the Dock were no longer minimized. That's a tiny papercut. Minimizing windows is a form of window management and everything got reset. Not the end of the world, but unexpected and mildly disrupting.