I just got the Eris on 2/4 and am considering returning it and waiting for the N1, so, when i called verizon cust service to make sure i would still have an upgrade availability on my line if i returned the Eris (Which i would) and asked if she had any info on the release date of the Nexus One.
She said it should be out by the end of March, but, again, it's a cust service rep and as always, take it with a grain of salt.
I do agree with the other posters though, we should be seeing SOME form of advertisement or talk about demo phones or SOME website talking about the release date...they're note THAT secretive about it. Think about every other phone that Verizon puts out, we at least hear release date leaks, website placeholders, pricing rumors, SOMETHING leading up the actual release date, and we got NOTHIN.
Just Spring '10. Garbage. Just gimme a taste!