There are several possibilities to use "Ubuntu touch" like "the official phones" or to install an image yourself, eg. on the Nexus 4. Who decides to update the OS?
When I check for updates it sometimes has updates for individual apps, but it has been a while for the OS itself. Now I have "Ubuntu 15.04 (r4)" (last updated 26/07/15), but "Ubuntu Touch OTA-5" is available for a couple of weeks. Who will offer me OTA-5 for my BQ Aquaris E5 HD? Is it BQ who decides? Is it Canonical? Can I do it myself (are chances bigger I will have a bricked phone)?
Updates of drivers are a different issue I guess: is it Canonical or BQ who will offer me updates?
And what about future versions, eg. Ubuntu Touch 15.10/16.04 LTS. Will I be able to install it on my phone?