I returned my DX at BestBuy after 13 days on Saturday. I called my VZW to make sure that the contract had been reversed. The person at my local store said that their system does not show a reversal, but that I should try Customer Care.
At customer care, I spoke to Jesse, about this and that I never got my new every two. He said that it could take 10 days for my contract to revert back to the old expiration date. I was not happy, so I explained to him, rather tersely, that I have gotten nothing but bad information from both VZW and BestBuy (which isn't his fault). I told him that I had to return the DX because I get no signal in my office, so I need something on the 700 MHz frequencies for better building penetration. I asked him when they will have a 700 MHz phone available, and he said "we have no launch date for the Thunderbolt."
I then asked him how much my early termination fee would be for all 3 lines, because I can't wait 10 days or possibly longer before I get a 700 MHz phone. He put me on hold, and here is the relevant part...
Jesse came back on the line and said "we just got confirmation that the Thunderbolt will be launched on March 17." He also said that there would be NO online presale. I think that VZW reps know the launch date, but are not allowed to say it for some reason. It seems that Jesse got special permission to tell me the date because they didn't want to lose an already upset customer to a competitor. Take this information for what it is worth. It isn't definitive without an "Official" announcement, but it is one more piece of the puzzle that points towards St. Paddy's day.