The hubbub is growing as Mac users prepare for news on Apple's forthcoming new OS, Mac OS X 10.5 "Leopard", which the company will offer to developers for a first look on 7 August at WWDC 2006.

The latest spark to the rumours comes in the form of a video of what is claimed to be a pre-release version of the OS in action on an iMac G5 1.6 GHz with 1.25 GB of RAM.

It's a very short clip, which seems to confirm multiple reports that the future version of the OS will feature a tabbed Finder window, obviating the need to hold multiple Finder windows open at once when engaged in certain operations.

The Finder itself seems to have developed a new solid-metal look, and the System Menu appears to have more functions than before.

There's no telling if the short video clip is real or faked, but it will certainly fuel excitement as 7 August looms.