If Qt's plans progress according to what they post on the mailinglist then
Qt 5.6 will be LTS, 5.7 will up the compiler requirements to the following:
Framework currently requires:
When frameworks started it had slightly less strict compiler requirements
then Qt had. But now that Qt is upping the compiler requirement, we should
follow as well. In fact, we should probably also update the Qt version
requirement which right now is at 5.2.
I have no clue when Qt 5.7 will be released, but i'm guessing around this
time next year.