Today (8/9/08) at Bandai Entertainment's Panel at Otakon, Bandai announced that Code Geass R2 (season 2) will start airing on Adultswim in October, a week after the last episode of Season 1. Meaning there will be no wait to watch season 2. They also mentioned that Gundam 00 will start airing on Sci-Fi channel this fall.
Source: Bandai Entertainment Premiere Panel, Otakon
Edit: Gundam 00 will start airing on November 17th on Sci-Fi's Ani-Monday. It will air between 11pm and Midnight. It will replace Gurren Lagan when it's finished.
Source: Anime News Network