Together with the TE release go various updates for freeware and payware airports in this region. For V5 I can tell it is:
OS9, 11S, 1S2, 1WA6, 2S1, 2W3, 3W5, 7WA3, KBVS, KCMW, KFHR, KHQM, KORS, KTIW, S43, S93, W16 and WA56.
Not all ORBX airports in the Washington area are V5 compatible yet, though. You won't even see them in ORBX central.
Karl