Update: March 19, 2010: And we're back. Canon claims it's fixed the audio recording glitch it introduced with Firmware 2.0.3 and it's up to 2.0.4, which you can download at the link below. My suggestion (which I make about all firmware and driver updates) is unless you're experiencing a specific problem that the update purports to fix, it always pays to wait at least a week for reports of software-induced mayhem to emerge.
Update March 18, 2010: But wait! If you go to Canon's USA site there's now a cautionary tale, way down below the huge ad graphic, warning:
"We have learned that some users of the Canon EOS 5D Mark II digital SLR camera are experiencing issues with Firmware Update Version 2.0.3.
We are working on a new firmware update to address these phenomena, which will be available soon. If you have not registered your EOS 5D Mark II, please register so we will be able to notify you via e-mail when future firmware updates become available for download."
Update March 16, 2010: You can now download the firmware update from http://web.canon.jp/imaging/eosd/firm-e/eos5dmk2/firmware.html.
In an odd "preannouncement," Canon finally confirmed the features and (sort of) the availability of the next major update to the EOS 5D Mark II dSLR that the company began talking about about six months ago. Though it's still not available, Canon issued a press release indicating that March is the target month. Firmware updates usually aren't particularly notable, but the forthcoming 2.0.3 release adds significant enhancements/fixes to the video capture controls and features.
In addition to fixing the main frame rate to capture at 29.97 frames per second--though typically rounded to 30fps in discussions, that's not the actual standard--the firmware update adds 24fps (and 25fps for PAL) capture for film-like recording. Semimanual exposure modes will also become available in movie mode. Finally, audio sampling rate increases to 48kHz from 44.1kHz, and you'll be able to adjust levels on the LCD.
My guess is Canon wanted news of the update "out there" in time for the WPPI show, which starts this week, given that wedding photographers are a huge chunk of the 5D Mark II's market. Canon Rumors thinks the download will be available on March 16. When it is, I'll update this post with a link.