The postponed date is still undecided right now, and GMM LIVE, the organizers on the Thailand side of things, will be refunding ticket costs for fans who already bought tickets for the event starting on October 5th. You can contact the following numbers for more information:
GMM LIVE - (66) 2669870
Thaiticketmaster - (66) 22623456
Oh well. Better late than never, right?