Speaking to VG247, Rebellion's Tim Jones has revealed that day-one special edition DLC for Aliens vs Predator will eventually be available for everyone else. The DLC will be made available on release day for those that purchase the special edition (which is pretty hard to miss) and, as is becoming tradition, vanilla edition purchasers will have to wait. As for the DLC itself, Jones says that it will include four separate multiplayer maps (two for the survival mode, two for other modes). Concerning future DLC, Jones simply says, "Watch this space."
Alas, it looks like our dreams of a day-one Alf skin for the Xenomorphs have been dashed. Here's hoping someone at Rebellion jumps on this potential DLC goldmine.