3145 Clans contains all the new units for Clans Wolf, Hell's Horses, Jade Falcon and Ghost Bear (Rasalhague Dominion).
Depending on which Clan you are interested in, you may want to check out other 3145 TROs.
Clan Nova Cat = 3145 Draconis Combine
Clan Sea Fox (formerly Diamond Shark) and Raven Alliance (formerly Clan Snow Raven) = 3145 Mercenaries
Clan Wolf in Exile = 3145 Lyran Commonwealth