Listened to that part of the podcast again this morning, worth noting that he also says there's about six months between the release of the Rage War books, so we can tentatively expect
Alien: Invasion in April/May 2016 and
AvP: Armageddon in October/November 2016.
As far as the Colonial Marines and W-Y still being around in the 27th century, I guess we can applaud the AvP universe for achieving Star Trek levels of social stability.