"Disgwyl i'ch gweld"
This literally means "wait to see you".
Here are some other options, depending on the context:
* "Rwy'n aros i'ch gweld" - "I am waiting to see you" (more formal)
* "Dwi'n edrych ymlaen i'ch gweld" - "I'm looking forward to seeing you"
* "Cewch chi aros i'm gweld?" - "Can you wait to see me?"
It's also important to consider who you're talking to and the tone of the conversation.