Doug Lombardi and Jess Cliffe interviewed about CS:Source on PC Zone's website.
You showed the Aztec level at E3 this year - what other classic Counter-Strike maps are being "Source-d" for the initial release?
Cliffe: So far we have upgraded Dust, Dust II, Italy, Havana, Piranesi, Chateau, and Office. More classic maps and new ones will be added to this list over time.