When I start Minecraft, after going through a loading screen, it takes me to a screen that says "Loading user data This may take a few moments." No matter how long I wait it never finishes, and if you hit "cancel" the game freezes. The only way I can get into Minecraft is if I sign out of my profile, load the game, sign back in, and then hit cancel. (It also indefinitely syncs on this page, so you have to cancel)
Thank you for your report!
We're actually already tracking this issue at MCPE-65946, so I will resolve and link this ticket as a duplicate.
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