Microsoft Windows e-XPedition.
Some smarty-pants at Microsoft has seemingly come up with this very clever use of word play. Apparently, the name is intended to invoke notions of 'e-home' as well as the familiar 'XP' and Media Centre 'Edition', elements of which are all found in Longhorn.
Q. Where do you want to go today?
A. On a Windows e-XPedition.
As you can no doubt imagine, there is no official confirmation of this name, or any other coming from Microsoft right now. This information should be treated as rumour until we know better, and may in all likelihood turn out to be complete and utter bunkum. Still, there is something funny about that name...