I don't know the answer, but I know enough about TFS to get a little scared.
If I understand you correctly, do you want to change the domain that your users authenticate with, but you want all the same user IDs pointing to the same accounts in TFS?
TFS is highly integrated with Active Directory and stores AD SIDs all over the place. It is also very sensitive to AD configuration changes.
It seems that I remember one client whom I know about who did this before, but I can not find details about it now. I believe that it is best to call Microsoft Product Support and raise an incident with support, because I have vague memory that there is some special tool that needed to be launched, but I could be wrong.
Good luck
Martin.
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