Switching between the live-tile UI and the usual desktop is instantaneous.
You can also do a split-screen interface, where you see both the new and the old UI side by side.
With Windows 8, apps are all optimized for touch.
PageUp and PageDown buttons will allow you to move between tiles on non-touchscreen devices.
It will have a new mode called “always on, always connected” – It’ll permit for instant wake-up from sleep and keep the ARM tablets constantly connected to the web.
It will allow tablets to connect to USB sticks
UEFI engagement will help with speeding up boot times – systems with SSDs in them could go from a cold boot to the Start screen in under 6 seconds.”
It will require a minimum of 1366 x 768 resolution for the best Windows 8 experience. 1024 x 768 will be the absolute minimum for the new UI fanciness and 1024 x 600 will let you run Windows 8 in the classic desktop mode.