User blog comment:JAlbor/Dishonored Interview Opportunity/@comment-5469467-20120929065038/@comment-4206713-20120929143845

1. Not in the game, but the devs have said that they would consider it (with a different protagonist) in DLCs.

2. They are not currently making or planning on making any. You can make new levels with UDK, however, but it would be difficult with no prior experience.

3. This question is probably better for the devs, but I'll give it a shot. Dunwall was largely inspired by both 1666 London, the setting in which the game was originally set to take place, and 19th century American whaling towns. The art style is based more on books and art (specifically paintings) than other video games or movies. At request of the developers, Viktor Antonov, the lead art director, who also created Half-Life's City 17, incorporated some inspiration from the Half-Life series, perhaps most noticable in the cars. As for the game, inspiration was taken from Thief, Deus Ex, Dark Messiah: Might and Magic, Arx Fatalis, and arguably System Shock and BioShock.

4. Yes, you can choke out guards.