I wondered why I had heard no fanfare or announcements (not even the Steam banner changing, its still Shmup sale up there) but on checking the page this seems to be the Overwatch school of sequel? Just update a current game and put a 2 on it?

Well. On one hand, doesn't seem like it needed fixing (Its not my type of game but its popular enough, certainly more than most other Valve ventures) but also geez. At least artificially pretend its big news.