Lens correction from RAW is coming from ADOBE with the release of ACR 6 and Lightroom 3. Lightroom 3 Product manager Tom Hogarty made this somewhat surprise announcement via the Lightroom Journal blog this week. Surprise as in the extent that it will correct optical issues and the new tools to support it.
I posted a News Item about it at this link:
Lens Correction in ADOBE Lightroom 3 and ACR 6.
There's a video (two sources) about the new capability and support tool details that will be available for custom lens profiling and inclusion.
I know this is one feature I am eager to get my hands on, even more than Content Aware fill.