If you're in the US, a preview is on tonight on Disney XD at 8:30 PM. And starting on September 14th, XC will air on every Saturday morning at 9:30 AM!
If you live outside the US, here are the channel listings directly from their information email:
"Cartoon Network International as our network home in the UK region, Latin America, Asia, and the Eastern and Central European regions. Gulli and Canal J are on board for France. We'll share information on airdates and time slots once it is available."
I hope you all are as excited as I am!