You'll have to pay for a $20 DLC to unlock two out of six clans in Vampire: The Masquerade - Bloodlines 2.
(www.eurogamer.net)
Here's how the clan selection screen looks at the moment:
As much as i love the 1st one, and that was playing it 3 years ago, I will not be playing this one anytime soon. I'll wait for a deep discount if they are trying to sell us what should be in the base game as dlc