Spawned village, 12 structures, 9 doors.
Same on my iPad 2 with iOS 9 for 0.12.1. Found a village and uncovered the doors to release the villagers. As long as I remained in the immediate area, they started breeding to the point where my device lagged. Killed them by zombie horde and then set carpet down at the "rave" area to take advantage of the bug that damages/kills small mobs to keep most of the kids from growing up.
I have an iPad 2 with iOS 9.2 and Minecraft PE 0.13.1. My Dad is running Windows 10 on his laptop with Minecraft 0.13.0
He tried logging into my world and received the Invalid or Corrupt Skin error. Changed his skin to Steve and was able to log in, but my custom skin was solid black to him.
I tried logging into his world but no skin (custom, Steve, Alex, or any of the free ones) could get me beyond the error message.