Well, I guess it depends on your definition of "soon." From the DPA FAQ's:

Is it true that DPA is running up against a deadline in May?

There is no deadline for the completion of our campaign. We have a minor limitation placed on us by the National Mediation Board that requires all Authorization Cards submitted be no older than one year from the date on the application for a vote. My Card is the oldest Card on file with a date of May 15th, 2010. The first 100 Cards were not in hand until late August. All Cards can be updated by resubmitting a new Card and destroying the old one. Should our campaign move into the fall, DPA will contact our oldest and most dedicated members and request they submit an updated Card. Let’s work together to finish our campaign before that extra work becomes necessary.