A few of us on the Massively team are fans of the Lance Henriksen-narrated lore updates for Star Wars: The Old Republic that explain the MMO's timeline in video. The guy was Bishop, after all! So far these videos have given us a good idea of the game's backstory and have dropped some clues as to what we may see in the title. One of the more recent episodes was Return of the Mandalorians which focused on the independent warrior nomads who rose to challenge even the Jedi. While they aren't evil, war is their way of life and they thirst for conquest. According to the latest timeline update, "The Empire Changes Strategy", the Mandalorians had some help along the way from the Imperial spies who orchestrated their ascent to power.
Henriksen narrates a tale of Imperial intelligence operatives pulling strings from the shadows for their Sith masters, and of the rise and fall of Mandalore himself. We think this continuation of the Star Wars: The Old Republic story is worth a look, and you can find it on the game's official site.