Ubuntu 14.04 will continue to work, the only thing that may change with this is there will be separate branches per release. This only helps us to maintain an even flow and focus on issues on a per ditro/rel basis.
In regards to OpenVPN. Absolutely! The script is in the repo at the moment and the next version of the script will have this all included as simple commands for creating .ovpn files on a per user created basis, much like how you type in createSeedboxUser.
Thanks for mentioning the ipaccess issue. That is an oversight with the older versions that was corrected in the 16.04 iteration of the script. I'll have that addressed as soon as possible for all other versions.
Since you have the means for testing, I could add you to the beta squad and you can review the guidelines within that forum. You can test (in your spare time) in regards to whichever versions (Distro/Rel) that you have access to.