empyrean_campaign is related to the final content of Flare-Game. I started it a while back but haven't gotten to return to it. If you enable fantasycore and empyrean_campaign and start a new character you can see a test map or two. Anyway that might change depending on the stuff I'm working on now.

I'm not sure what new_game_mod is, but I imagine that's the mod containing his new content.

The new_game_mod is the mod created by Ryan Dansie, he hasn't found a great name yet. (At least I assume he wants to change the name :D)

Information about that mod is in the other thread http://opengameart.org/forumtopic/new-flare-mod-contributors-wanted