Is it only gamertage that haven't moved to xbox 360 before or is that just the majority of where the gamertags are coming from? On fb they mentioned on what qualifies as an inactive account as
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Not used for so long that it's owner never migrated it from the original Xbox to the Xbox 360.
is what they said but did not specify if that is the only way for them to become available again.
Hoping that its just inactive for x amount of years since there are some really good gamertags that people migrated to 360 but been inactive for 5+ years.
Start looking up gamertags you are interested in and look at the game history and when last played if its past games are xbox only and not 360 it looks like there may be a really good chance it will be available to maybe get a list of some that you would like so you can try to create them as soon as they release the gamertags.