The expansion will have:
-a few more areas of Moscow.
-a few more quests concerning the disappearance of Marat.
-a much more expanded storyline after the Moscow Catacombs quest.
I'm not sure about some other features in the mod. It really depends on my time and how successful the scripting is. That includes, Time Trials for a reward. But again, I'm not sure how those time challenges would work out.
This expansion will be set for release somewhere later this year but the release date is not set in stone yet. I'll put the status to "unreleased" for the moment. I'll also put in the AOA 1.1 file that a lot of people have requested.