Well, assuming it is true (and who knows if it is), with all the variety of rumors, you pretty much can expect just about anything. IF it is true, of course things will begin to come out the closer it gets, so you'll have someidea a week or two ahead.
Personally, If someone started a pool on announcements, I would go with CES 2011. I've had a weird feeling about CES with Verizon's CEO doing the keynote, the timing of all th erumors of production, plus that being about 6 months after the iPhone 4 came out, I can see them keeping the phones off cycle for a variety of reasons, including as an part of a package of enticements to ATT to potentially allow them to get out of their deal slightly early. Could defintely be nothing to it though.