If you ever needed a hint that it's alpha / beta software, that's it.
Pretty sure that's not the final layout, if only because the window widgets are so awkwardly positioned. My guess is, the layout is made to work with whatever GUI they're testing for Lion, and they just switched some stuff so that they don't leak any of the actual GUI before it's ready.
I would assume that for the final Snow Leopard version, it'll either get the vertical lights like in iTunes, or be moved to the top with a normal title bar.