We have seen leaked images and downloads of Windows 8 OS but this time Microsoft has finally unveiled the very first video demonstration showing us what's in the store for upcoming major upgrade to Windows platform.

The video demos the next generation of Windows, internally code-named “Windows 8”. According to the official announcement the "Windows 8" based PC is really a new kind of device completely revamped from the chip to the user-interface, one that scales from touch-only small screens through to large screens, with or without a keyboard and mouse.

The demo shows the metro tile based user-interface for a new generation of touch-centric hardware. Fast, fluid and dynamic, the experience has been transformed while keeping the power, flexibility and connectivity of Windows intact - watch the full video after the jump.