PSA: SCREENSHOT EVERYTHING BEFORE UPDATING!! And create cloud account!!
I've seen multiple posts already about people losing everything with the update. A valid cloud account should stop that, and screenshot should help get your account fixed if you do lose everything.
edit: from u/fuddsworth
There's a couple cases of save issues so far, but we're already fixing that so it won't be the case for others
We have back up saves we are able to roll players to