My review of Unknown Regions, the final source book for Star Wars: Saga Edition is up on GameCryer.com. The Unknown Regions is nominally the splatbook for scouts, adding a bunch of new feats and talents for the basic class, but there's actually a lot more to it than that. There's an expanded system for creating hazards -- things like lava flows, erupting geysers, and avalanches that can do damage, but aren't creatures -- as well as rules for near-humans, mounts, a bunch of new worlds, mini-adventures, a random world generator, and a wealth of talents, feats and equipment for scoundrels, soldiers, nobles and Jedi.
It's a great book to end the line with because it gives game masters everything they need to spawn a thousand new worlds and keep their campaigns running for years to come. It's already become a staple of my campaign. Read the review.