Well, I'm half way! This is Win 7 using IE 8 Beta. It connects to the Internet, and does some stuff. I don't think it's killed the primary XP Pro installation - I'll find that out soon. It has removed the Grub boot option that starts the Linux distros, but I can soon put that back - and hopefully set it up to start Win 7 as an alternative.
It won't connect to my network. It wants me to set up its new network, which has to be called WORKGROUP, and has a wacky long password of its choosing. That's the first "serious issue" with it so far.
I'll take a peek at those "Secrets" when I've done playing...