The current version of UBB.threads is version 7.6.2, and was posted just weeks ago. it includes security fixes, and it is stable, and current.
https://www.ubbcentral.com/forums/ubbthreads.php/topics/261663/7-6-2-changelog-discussionPhp 5.6.38 was posted just 3 weeks ago. It is current, stable, and secure.
http://www.php.net/ChangeLog-5.php#5.6.38Your questions have been answered with as much clarity as possible.
We are striving for both security and stability. But if you don't care about stability (or security) and you just want php 7.0 support, you are welcome to apply to join the beta program and run beta software in your production environment. But that is not advised at this time.
You are also welcome to download the current release version (7.6.2) of UBB.threads from the Member Area and customize/update the code to be compatible with php7 and MySQLi and Smarty3.1 on your own, until a release version if the package is available.
Please give an honest and realistic estimation.
What's already been posted/linked within this thread is the most current information that I have for you at this time.