It's been in the works for a while, promised but not yet delivered, now promised again for Oct. 30, 2012: The Lightworks video-editing software is coming to Linux, specifically to Ubuntu 12.04 (and perhaps others after that).
Having really never heard of Lightworks, which the OMG!Ubuntu post above says was used to edit such professional films as "The King's Speech" and "Hugo." The project was open-sourced in 2010, and there is already a Windows build available. I'm somewhat excited by that prospect in itself, as I haven't yet come up with a Windows video-editing workflow/application that I can both use myself and recommend to others.
You can bet I'll be trying this out asap and waiting for the Linux version. If it only runs on Ubuntu, a video-editing app that can really get the job done is enough for me to choose my OS accordingly. That's a big "if." I'll have to get some actual time in front of Lightworks before I can make any judgments.