Here's what I've got penciled in for unique units per clan:
+ Otomo - European Mercinaries and European Ships
+ Shimazu - Unique Katana and Tachi Ashigaru and Samurai
+ Akechi - Unique Matchlocks
+ Ukita -
Can't think of one... improved ships... improved samurai... anyone got ideas?
+ Oda - Unique Ashigaru (Bow, Katana, Matchlock, Naginata, Yari)
+ Date - Unique Tachi and No-Dachi Ashigaru and Samurai
+ Takeda - Unique Cavalry (Light, Bow, Yari, Katana, Great Guard)
+ Tokugawa - Unique Kisho Ninja
+ Shibata - Unique seige equipment (Canons, Fire Projectiles, Fire Rockets)
+ Hashiba - Unique Ashigaru (Longer Travel Distance) (Bow, Katana, Matchlock, Naginata, Yari)
I'm still thinking of the economic bonuses to each clan, or if they'll have them...