Update: GigaOM now reports a Verizon official as stating that it already has a handful of markets running EV-DO Revision A as is, and while they intend to launch a Rev. A-capable card in the near future (almost certainly the previously mentioned AirCard 595), it will not be announcing the launch of the network in an official capacity until it takes a significant number of additional markets live. Of course, official announcement or no, customers might be able to take advantage of some turbocharged wireless data in the near term just as soon as that AirCard starts shipping.
*Verizon is currently in the process of acquiring AOL, Engadget's parent company. However, Engadget maintains full editorial control, and Verizon will have to pry it from our cold, dead hands.