I had been hoping that the GATS Article XXI arbitration in the Gambling dispute would be as transparent as regular WTO disputes. I'm not sure that will be the case, though, as the arbitration requests have not yet been made public on the WTO's web site (as far as I can tell, anyway). So, the best I can do is follow the reports in the Antigua Sun:
[Antigua's attorney Mark] Mendel told the SUN that the new arbitration process is likely to take a month or two to get going and several additional months of briefings and hearings before a decision is reached.