Mojang has put up a blog post with the latest update to the Vita version of Minecraft. Not much going on, but the 56MB patch adds the Doctor Who skin pack trial, which comes on the heels of the Star Wars content from August
Change log for Patch 1.20 - September 23rd 2015
Added Doctor Who Skin Pack Bundle Trial content.
Fixed a memory leak causing frame rate issues.
Fixed an issue causing signs to go blank for network players.
Change log for Patch 1.19 - August 28th 2015 (in case you missed it)
Added Star Wars Classic Skin Pack Trial content.
Added Star Wars Rebels Skin Pack Trial content.
With Minecraft by far the best selling Vita game around the world, hopefully Mojang will keep rolling with the changes!