Neither school nor anyone in the metro area have officially announced this change of game and venue as of yet.
The Diamond Dogs played for their first time at Trustmark Park last April, a year after the facility—home of the AA-affiliate of the Atlanta Braves—opened. Even before then there was speculation over the future of the Mayor's Trophy game, sparked by opening of the up-to-date new facility. Also, the future of Smith-Wills Stadium itself is in doubt with proposals from promoters to replace the aging facility.
There had been informal talk that the traditional Mayor's Trophy game might be played along with a second game between the Dogs and Rebs in the metro-area. That does not appear to be an option for 2007 because with the Governor's Cup game the MSU schedule is at the NCAA limit of 56 games already.