1. ActionScheduler 3.0.0 is a big enough migration that it warrants a 2.0.0 release.
2. I'm also considering renaming class files to match the WordPress Coding Standards conventions for filenames.
3. I may also convert the plugin to an autoloader library.
4. I will likely remove any deprecated methods from 1.x versions.

All of these changes are backward-incompatible and will need to be noted as such.