First of all, I'm using an iPad Mini 2.
For the bug, when I open up the game, it shows the "Mojang" logo then it just crashes. I was playing MCPE earlier today in 0.15.0 and the problem wasn't happening. Also, the game isn't closed, I can double tap the home button and go back into MCPE, but it's just a black screen, and after a second or two the screen flashes white and then it exits me out of MCPE again.
Lastly, the App Store updated it to 0.15.2. I was unable to select 0.15.2 as the version it affected, so I had to pick 0.15.1.