PHL is the most likely new hire domicile on the East, but there have been some scattered DCA slots too. Aside from the E190, the DCA A319/320/321 is next to most junior.
I've read somewhere (probably on the APA site) that they may send new hires to the S80 since they are delaying their retirement to 2019. Not a confirmation, just a possibility. And most S80 flying is done out of DFW these days.
Post October, when we have one list, PHL, MIA, LGA and occasional DCA and LAX will likely appear in new hire class drops.