As far as i can tell, Kozmo.com is now registered by Yummy Foods LLC which operates Yummy.com, a chain of mini supermarkets in the Los Angeles area.
I believe that they are either doing a PR stunt, or that they are planning to offer deliveries under this brand name instead of Yummy.
Funny enough, when we launched Postmates we toyed with the idea to create a Kozmo themed teaser page but ultimately decided against it.