As you may know, Ubuntu Touch OTA-4 has been recently released, but the developers are already thinking at the OTA-5 update, which will be most likely released in July.
Among others, the Ubuntu Touch OTA-5 will bring new icons for all the Ubuntu Touch Core Apps and that full shell rotation will be integrated.
But before Ubuntu Touch OTA-5 gets released, an OTA-4.5 update may be released by Canonical, to fix the issues occurred with the switch to Ubuntu 15.04 Vivid Vervet.
As a reminder, Ubuntu Touch is available by default on BQ Aquaris E4.5, BQ Aquaris E5 and Meizu MX4 and officially supported on the LG Nexus 4 phone.