Okay, I tested it now for some time.
The main difference is the look of the program. Had some trouble at the beginning with setting In- and Outpoints in the Source Monitor, but reinstalling Visual Studio seemed to fix it.
Good news, when Premiere crashes the Picture freezes and I have some seconds to save the project without problems.
Bad news, it crashes as much as 2015.3 did.
When exporting text to AE, it’s still a black solid. (should have been a new feature, though) The subtitle function is useless as ever. So I don’t know, why they praise it as functional.
Couldn’t try the new team function.
That’s it for now. Can’t see a reason to update right know. But hadn’t any problems with converting the project file to the new one. All media were still linked, so I guess I was just lucky?