#2 would be the wide variety of keys provided by a PC keyboard. #3 would be a large, high quality monitor. #4 would be the ability to upgrade video cards and other hardware from a vast secondary market. #5 would be being able to use the computer for other purposes than gaming.
There was a shot in the video with the device next to a mouse. I think it's still a full on PC, you can bring a mouse if you want to. It's "just" sort of a funny form factor netbook.
Que the $80 Razer mouse.
Razer. Don't make fun of things you don't know about. High quality mice are important. What would you buy instead? I looked at logitech mice of high enough DPI to use on my 27" iMac without any acceleration and I was not impressed. Razer makes nice stuff.
I actually use a Logitech G5 mouse and a Logitech G15 keyboard and I love them both. The mouse has a really nice rubber feel, adjustable weight (which is actually a nifty thing once you realize how much that weight matters), and some really nice side buttons.
Not that Razer is bad. I used to have one of their keyboards and I liked that as well.
I have Razer mouse (Copperhead, blue LEDs ftw). I'm just saying that Razer is probably not motivated to nix their mice line and go pure-button or touchscreen. They will be more than happy to sell you their mice with their mini lappies.