This PDF document, [i][url]http://manuals.info.apple.com/en/Logic_Studio_Installing_Your_Software_Upgrade.pdf[/url][/i] states:
"If you are upgrading a previous Logic Pro version ... connect your XSKey to one of your computer's USB ports.
[b]Important:[/b] Do not throw away your XSKey after installation - you'll need it whenever upgrading to Logic Pro 8 (or reinstalling it, if necessary)."
My box arrives tomorrow morning, but that seems pretty definitive to me.
Note: This only affects buyers of the $199 "Logic Studio Upgrade from Logic Pro or Platinum/Gold 5,6,7". Owners of the full $499 retail box or the $299 "Logic Studio Upgrade from Logic Express 6,7,8" will never need an XSKey since, obviously, they never had one.
I suspect your copy can't be an upgrade, Martin.