As you may know, Canonical has decided to upgrade its Ubuntu Touch on a monthly basis, OTA-6 being already under feature freeze.
Among other enhancements and new features that will get implemented, Canonical will also add their brand new, fast and scalable thumbnailer service on Ubuntu Touch (and Ubuntu Desktop).
The thumbnailing service is very useful, due to the fact that all the apps display thumbnail images for multimedia multimedia elements and this operation was CPU consuming and ate some bandwidth if they had to be downloaded from the internet.
The new Thumbnailer will be also present on Ubuntu 15.10 Wily Werewolf, which will be replacing the Unity scrollbars with the GNOME ones, on the Unity 7.