It appears that Yahoo is testing out a new homepage with a completely redesigned layout. From the image you can tell that they are trying to condense all of their navigation into a few key spots (notably the sidebar). I believe that this is a nicer interface than the current Yahoo Homepage but it still seems to have a lot of information stuffed on to one page.
If you want to be able to try out this page then you better hope that you get randomly chosen (that is how it appears they are choosing people). If happen to get chosen then Yahoo will redirect you to this page to notify you of the change. Unfortunately, that link does not enable the new homepage so that you can test it, instead it is just what gets displayed after they have ‘selected’ you.
News Source: TechCrunch