For some reason all these pics that come out are badly artifacted jpegs.
If I ever came upon experimental Apple software, at least I'd post the uncompressed screenshots so people could at least know it took me more than five minutes to Photoshop. I find it hard to believe the second picture of those two would have taken much longer than that.
Path in column view is the first thing to grab my attention. I'd like that sooner than Leopard though. And a proper Trash in the sidebar (no, there isn't one in the screenshot). Even Mail has one, why can't Finder? Dragging the folder in the sidebar now only results in a regular folder icon and no empty function from context menu.
Pages in TextEdit is a nice touch of realism, I believe that will happen, quite possibly in a Tiger update.