As of this writing v13.16 is being offered. Other than being listed as a maintenance release there are no specifics on what has changed.
The best bet is to install the latest, and check it out. Dependent upon your PC, 13.16 may load files and export projects more quickly than the 12.x series.
It takes only seconds to over-install. No need to uninstall. For licensed users upgrades are free for up to six months from purchase date.
There's never a mandate to switch, and your version won't expire.