Windows 8 is joining the 8-inch tablet bandwagon with a new device from Acer that will launch later this month and come with a price tag between $400 and $500. Acer unveiled the Iconia W3 on Monday, a day before the start of the Computex trade show being held in Taipei this week. Acer claims the device is the world's first 8-inch tablet to run Microsoft's Windows 8 OS, which has been struggling to grab consumer interest.