I don’t know if this has been mentioned on the thread, but here is a pretty game-breaking bug that prevents my team from moving to 4.8 at all. So hopefully it will get fixed in 4.9 or sooner. It basically makes blueprint default values useless in our packaged project, forcing you to set the default values one by one using Set nodes instead.
This one is another bug that is present since 4.8 and breaks the game for people who are using solid black backgrounds (makes it grainy). Personally, I find the ‘new’ bugs that were not present in the previous versions the most annoying. 