Development work has started for Moodle 3.1, which will be the next stable release of Moodle LMS and is scheduled to be released on May 2016. Moodle 3.1 will also be an LTS version similar to the lines of Moodle 2.7 which was the first LTS version from Moodle.
In a recent Moodle Tracker issue MDL-51580, opinions by the Moodle Community members are sought to decide the PHP/DB/Moodle versions requirements for Moodle 3.1 and push them to environment.xml
The due date for the tracker issue to vote is 30 Nov and the issue is created by Eloy Lafuente.
According to the tracker issue description:
We need to decide ASAP about all the PHP/DB/Moodle versions requirements and put all them into the environmental tests (adding them to all supported branches).
At the same time, if there is any change in the PHP version… some changes have to be populated to various installers and replace them by the new one when corresponding.
If you are also a developer then you can vote for the requirements for Moodle 3.1 in the Moodle Tracker here.