Even though Webzen is not participating at G-Star 2014 in November, it is assuring that development for MU2 is going on smoothly via updates from the Korean development blog. There apparently isn’t a big difference in UI design compared to the original MU, and the game is looking pretty.
A previous development post previewed the design of a new boss monster, which is looking kind of sinister and dark. While there might be many similarities to Diablo III, hopefully Webzen will introduce new and unique features in MU2. More details for MU2 can be found in my previous posts.