I finally installed v1909 (via a clean install). I didn't notice any bug (unlike Vasudev I have no audio issues). I couldn't see any major changes either.
I agree. I installed it under VirtualBox and it installed and ran perfectly, even better than previous versions. The problem with this thing is upgrading from a previous version of Windows. I tried this and the whole thing crashed when it reached 67%, forcing me to restore 1809 from backup. Hopefully someone will find a way to fix this because for me a total wipe and clean install is out of the question. No time to reconfigure the OS and reinstall+configure the apps.