Arleen Sorkin not to voice Harley Quinn in Arkham City?

Yeah, it seems that Arleen Sorkin, the voice actress that voiced the character the various incarnations across the DCAU and in the previous Batman game, won't be returning to the role this time around.

Instead the Joker's infamous sidekick'll be played by Tara Strong, the actress who voiced Batgirl in BTAS and Raven in Teen Titans. She's certainly a strong replacement for the role, but considering this'll be Mark Hammill's last time in the role of the Joker, it just seems a shame that the pair couldn't finish on the same note. Ah well.

http://www.comicsalliance.com/2011/05/23/harley-quinn-voice-arkham-city-arleen-sorkin-tara-strong/