Geoff Keighly has been trying to replace E3 with his Summer Games Fest. That's where a lot of announcements come out. Iirc, Keighly said that this Gamescom wouldn't be reveals for new games, but updates on ones we know are coming.
I'd say neither are really replacements for E3, since E3 had showcases from PS/Xbox/Nintendo. Nowadays all the major publishers and console makers have their own reveals.
I've not changed phone OS's before. Is it possible to switch back after you've changed? Or is my best bet to run an emulator with it somewhere to see if I like it?
I think the same studio is putting out a Quidditch game. Wonder if they purposefully kept it out of the first game because the separate one wouldn't be worth it if it was in the original.