A really bad thing is that a lot of people are unable to keep their work going because of some strange bugs (in fact most projects which cannot be moved from P4 to P5) which came up wiht Preview 5. bug report section is full of posts on Answer Hub. I know that epic staff is working hard on fixing bugs and new features and so on but it would be really great if someone could answer these bug reports that people stop refreshing their browsers 
. A short message that staff noticed about posts would be enough.