This is entirely unfounded guessing. Everything I've heard/seen indicates that Google will not be producing another device. Its existence pissed off their partners, it didn't sell extraordinarily well (I think being only really usable on T-Mobile, and eventually AT&T, caused that problem), and it has reportedly been discontinued. The Nexus One website recommends other phones for people who want to use the two biggest networks (Sprint and Verizon). And, of course, the networks kinda hated it because it undermined their position as arbiter of what goes on phones.
Of course, all the things that networks hated about it were things that consumers should have loved about it, and I wish there were a Nexus Two just around the corner...but I'm not holding my breath and when my contract ends in a couple of months, I'll buy whatever the latest generation Android phone from Sprint or Verizon happens to be.
Regardless, this is not a substantive article.