With a license, you get access to the dev builds[0].
Most, if not all, of the new features of the 3.0 release were present in the latest dev version (the dev builds get updated much more frequently, as opposed to the public build, which was last updated Sep 2016).
Most, if not all, of the new features of the 3.0 release were present in the latest dev version (the dev builds get updated much more frequently, as opposed to the public build, which was last updated Sep 2016).
[0] https://www.sublimetext.com/3dev