The build completed successfully. It took exactly 5hrs. I was checking in on it remotely over teamviewer from my phone at work. I plan to test fly it later this evening when I get home from work. Thankfully if I run the build again, it only rebuilds the changed files and takes seconds or minutes instead of hours.
Yes. I do not know when yet as I haven't even loaded and tested what I have so far to make sure the build system worked correctly. I also need to tweak some things and get the right version of ArduCopter in there and rerun the build one final time. And I need to make a new golden image (factory reset partition). And I need to package and write a script to install it via Solex. So coming soon, but please don't expect it this weekend.
I fully intend to make a similar update for the stock solos too. The primary purpose of that will be to cut the cord from 3DR's update servers and update the golden image (factory reset). This will probably come after the green cube one is done. As new development progresses, the will probably be some things backwards compatible and some that aren't.