Yes, another Windows 8 tablet. After getting hands-on with some new devices from Acer, ASUS and Samsung, you might already having trouble telling one device from the other. You might even say the same about Lenovo, which is showing off an early-stage tablet here at Computex. The difference? We can't remember the last time we saw even a Windows 7 tablet by Lenovo. So when the company trots out a slate running Win8, it doesn't just feel like a mandatory upgrade from one OS to another; it feels like Lenovo entering a new category.