If you go to google.com, there is a line of text that reads "Nexus S, a pure Google experience. Get it FREE today only"
It requires a 2 year contract or an extension of your existing contract. I wasn't impressed with the Nexus S when it came out but my Nexus One is seriously aging and I'm contemplating getting a Nexus S. I can't make up my mind because I want to wait for something better too. Oh well, in case you missed it, go to google.com and click the link.
Android and Linux