Cnet: The first clue is the video of a betta fish swimming from one edge of the screen to the other. Thought of as Microsoft's mascot for beta versions of new operating systems, that particular fish swam its way onto the desktop of the beta for Windows 7 in 2009.
But other more obvious clues are the hot spots and links scattered across the screen that refer specifically to Windows 8 Consumer Preview. Since the page is still a work in progress, most of the links don't yet work. The only two that do bring you to a page for developers eager to create Metro-based apps and another one for Microsoft's Building Windows 8 blog.