Wired UK interviewed Steve Harber, president of Sony's Digital Reading Division. Not much new information, but:
The US will also get the 3G-networked Daily Edition model, but Haber doesn’t have any news on a possible UK launch. He does, however, say that we "should expect more Reader models".
Something like a PRS-510 would be nice, but I don't really see it coming. Maybe a model with WiFi (as opposed to 3G)?