A new Steam Update (thanks Shacknews) has a screenshot with a sneak peak of the upcoming Aftermath episode for Half-Life 2, along with word on plans for the next Counter-Strike Source update:

The next big Counter-Strike release is set to include two maps. The first map will be de_port, previously mentioned here. This map is set in a resupply port for outgoing ships. The gameplay is designed for a balanced layout employing a mix of long sightlines with cover and close quarters fighting environments. The second map will be a completely redone de_inferno, a historical favorite at CS tournaments and competions. We'll be releasing some screenshots or other media from both of these maps in the next week or two.