Hi @timmy28x
Thanks for the questions.
1. No, the 5.8.0-beat3 has remained untouched, and does not contain any of the new functionality. I plan to release a new 5.7.12 version tomorrow to address the bugs in 5.7.11, then begin work on 5.8.0-beta4 which will get all the new updates from 5.7.x
2. Yes, our update system will allow betas to appear in the wp-admin plugins page 🙂
3. Good question. In theory, there should be no issues. We are not planning to make any breaking changes from the current 5.8.0-beta version. We do plan to change the way values are stored within the block JSON, but we will be sure to do this in a “backwards compatible” manor 🙂
