Star Trek Online has always been the game's sprawling skill system, but it's also proved to be something of a weakness. Not only were several of the skills difficult to understand at a glance (Astrometrics offers benefits not instantly apparent, for instance), but the higher-tier skills were often prohibitively expensive in terms of skill points. That's why in addition to all of the other changes going live with the game's free-to-play conversion, the development team is working on a major skill overhaul so that players can know what each skill does and so that everything feels worthwhile.
A list of the new skills and their effects are included with the newest installment of the Path to F2P blog, with the changes allowing players to more easily switch between ship types and weapon types without feeling unduly penalized. In addition, skills are now clearly separated into buffs to click abilities or passive benefits, rather than having them tied together in several cases. It's a wide-sweeping set of revisions but hopefully one that will help make the system more transparent for all players.