The playable Clans in this game are as follows:

Assamite (With Special Permission)
Baali (With Special Permission)
Brujah
Capadocian (With Special Permission)
Caitiff
Daughters of Cacophany (With Special Permission)
Followers of Set (With Special Permission)
Gangrel
Giovanni (With Special Permission
Lasombra (With Special Permission)
Malkavian
Nosferatu
Ravnos (With Special Permission)
Salubri (With Special Permission)
Samedi (With Special Permission)
Toreador
Tremere
True Brujah (With Special Permission)
Tzimisce (With Special Permission)
Ventrue

(NOTE: For clan descriptions and weaknesses, please refer to http://www.patman.org/wod/clans/wodclans.asp or Wikipedia)