Prediction: Ubuntu and Dell
PLEASE prove me wrong!!!
Dell will half-heartedly role out a few PCs preloaded with Ubuntu. Any possible market share will be diminished by the lack of enthusiasm displayed by Dell. As a marketing ploy they appealed to the voice of public opinion. When sales tank due to lack of their belief in their product the Dell PR guys will stay away in droves.
When, not if, folks start to have questions about 'how to do this' or 'how to fix that' Dell will throw up its collective hands and say, "Well, you know that Linux is Open Source. Go ask the community how to 'do that' or 'fix this'." Without a clear profit incentive Dell will hardly be willing to invest in the necessary support to get their products over the initial bump. When the first report comes back that Dell isn't standing behind their Linux systems customers will join the PR guys, staying away in droves.
People, the few that actually buy the Ubuntu PC, will then raise such a verbal stink AND POINT THE WAGGING FINGER at Linux and say, "This Linux stuff sux!" Gimme back my warm&fuzzy&bloated&addictive Weendoze.
The whole thing should take no longer than 4 months from the date Dell first ships...