I'm not sure what all it includes (my sister plays computer edition more than I do), but there will be polar bears, slightly improved villages, Windows 10 support, and....I'll update this later after I look it up! Lol.
PE was also updated a few weeks ago to include Pistons, two new weird mobs, horses, mutton from sheep, the ability to ride pigs, "zombie villages" (they're full of zombie villagers and cobwebs, but they're otherwise normal)' and jungle temples. Basically, some things to make it closer to the computer editi N.
