Saw Jill N. yesterday, who said that right now they are anticipating hiring more in Sept. ( there is still 1 class' worth in the pool).
Experience has shown, though, that things change here on a weekly basis. I would be surprised if we really went that long without hiring.
The computerized line bid system indicates that there are 50 B717 F/O's that have are still in training or have not yet completed IOE, so as those work into the system, and as we keep taking 2 B717's a month, my guess is that some time in July, someone will say, "Hey, we need to get some more B717 F/O's in here!" and then they will start calling people, frantically. . . . . so if I were you, I would get an AirTran pilot to walk your stuff in June, and then every two weeks.
Good luck- it is definitely a good place to be. I hired on in Nov., and sat reserve for only a few days, then went right to being a line-holder. We are looking at a short upgrade of probably less than 18 months. Adding new cities every month, 20 new planes this year (less 14 DC9's) for a rough total of 66 airplanes. Currently at 750 pilots, rumored to be around 1000 by years' end A( I am guessing around 800-850).