Fallout 3: Mothership Zeta developer Jeff Gardiner has said that the upcoming downloadable content has "the most high tech weaponry in the game" and released a bit more info on your new toys and the inevitable new perk.
According to Gardiner, speaking to MTV, there's a Shock Baton for melee fighters alongside the previously announced Alien Atomiser (pistol), Alien Disintegrator (rifle) and Drone Cannon.
Gardiner also mentions a new grenade, the Cryo Grenade, "which freezes enemies for a short period of time". "On top of that there are new unique weapons, and a new heavy weapon." One of those may be the Drone Cannon, which he didn't mention in the main body of his comments.
As for the perk, it's called "Xenotech Expert" and "increases the damage you do with alien weapons, including the Alien Blaster if the player had found that in the wasteland". The perk is mission-specific, however, as the level cap is not being increased again.
Mothership Zeta sees players responding to a distress call in the Capital Wasteland and being transported to an alien ship, out of which it seems they have to fight their way. New screenshots released yesterday elaborate on some of the very un-Fallout environments.
MTV's interview also mentions that once you've finished the main DLC quest, you'll still be able to return to the alien ship, and that this will be worthwhile to access the "Alien Epoxy" which automatically repairs items by 25 per cent even if you don't have a duplicate.
Mothership Zeta is due out for PC and Xbox 360 on 3rd August and will cost 800 Microsoft Points (GBP 6.80 / EUR 9.60). It will be available for PS3 as part of the Game of the Year edition of Fallout 3 due out in October on all formats, and as a downloadable at some point after that.