I'm not seeing any reservation option.
I've seen that "business users" are not getting this option, but I don't know how Windows determines if you're a business user or not. My computer is running Windows 7 Ultimate English x64 on a normal home computer and home network.
edit: There it is; the reservation icon popped up while I was typing this post. Had to happen to me, didn't it?
I wonder how many millions of people are going to actually overlook this icon

And I wonder how many millions expect a 'normal' (SP-like) update and then get scared into oblivion when their entire OS changes in a few months

Also, there will probably be a lot of people who will mistrust this icon/dialog, thinking it is spam, adware, or some sort of malware, trying to trick them into something bad...