According to the post by Co-Founder of Final Form Games Mike Primo on the PlayStation Blog, Jamestown+ brings along with it a slew of new stuff. There’s a Platinum trophy (they make sure to put that at the top of their feature list, knowing some of the PlayStation community will ask immediately), three new ships, two new levels, remastered audio and the availability of the game’s DLC.
If you like bullet hell SHMUPs, you might want to check out Jamestown+ on the PlayStation 4. That goes double if you game with friends. This is a good one.