How do I prepare to Skype discussion for PhD admission?
There is really no way to predict who will attend unless you ask. But I would suggest that you think of it the same way you should think of a Statement of Purpose document. Focus more on what you expect to accomplish in future rather than what you have already done. Use the past only to support a trajectory into the future.
What questions are you looking at? Are you close to resolution? What do you see farther out? How will this place help you achieve the goals?
Ten minutes is no time at all. Don't spend time clearing your throat.
But be yourself.