If you move a guild a new level 1 guild will be created in it's place with the following Guild Message of the Day;
Your guild has moved to a new realm! Please visit [this web page] for more information.
I know this cause the guild my horde paladin and shaman moved to another realm :S
Good thing we made a new one tho!
And good pointer about holding names in the other thread! Gonna go do it ASAP!