6.2.3 has lots of bugs. It's not just a beta that's close to ready. I think the beta is on 6.2.2. I offered to test 6.2.3 and there are quite a few issues with it atm BUT transitions are there. In all honesty I'd stick with either the non-beta or the beta version for now until 6.2.3 is more stable.
I'm not sure what you did @marians717 for an hour but there are plenty of bugs in 6.2.3 (which the testing team acknowledge) hence why they haven't released it as a beta yet. This is a misleading post.
This is correct, the 6.2.3 has still many bugs so it hasn't been shared via the PlayStore beta channel - however I've shared the .apk with three users to test only the 360 Keyframing / transitions feature.