googling gives weird mixed messages. some state that the engine cannot use AA where-as some claim that a bloke from EPIC actually states 'The most visible DirectX 10-exclusive feature is support for MSAA on high-end video cards. Once you max out the resolution your monitor supports natively, antialiasing becomes the key to achieving higher quality visuals.'and also I used AA in Bioshock, not sure if it did anything mind just did it too be on the safe side!
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Unreal engine + deferred shading using DX9 generally doesn't have an MSAA resolve. In DX10 some developers implement one form of anti-aliasing or other - some go for MSAA and others try to pull off things like edge filtering that never really give good results.
Most developers have come to the conclusion that the best way to do it is to forget AA entirely and leave it to ATI and nVidia to brute force it per application in their drivers.