WICKED tour cast question

I apologize in advance if this has already been discussed and I just didn't find it when I searched, but...

Does anyone know when the original touring cast of WICKED is contracted to leave? Does anyone have plans to leave before anyone else or is the whole cast in it for the long run?

I'm seeing it in October in Dallas, although I haven't bought my tickets yet, and I was hoping that the whole cast would still be in tact by then. So, I was just asking.

Thanks.

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One of the ensemble members named Adam Lambert (Ensemble/Fiyero u.s.) is scheduled to leave when it ends in S.F.

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