I updated MCPE to 0.16.0 from the AppStore, created a NEW world on "Infinite" and "Normal" difficulty, and upon the "Generating Terrain" screen, my device (iPod Touch 5th gen, 16gb blue, iOS 9.3.2) crashed. I then tried opening a world I already had created before the update and it did the same thing.
I then tried creating a NEW "Flat" world on "Peaceful" and it finally loaded with no issues. Occasionally the world would crash randomly while playing, but the main issue is the one above.
This also happens when I import the Alien Invasion Add-On world.