I sent an email to a professor to ask for a PhD position for one of his "few listed" projects, in which I am genuinely interested in to pursue my future research career. He responded that he would want to see my academic transcripts, which I provided. Next, he shown interest to talk over Skype and suggested a date and time. He confirmed and sent me one of his publication link and asked me to read it meanwhile and will discuss during meeting.
I want to know what are professor's expectations? What would he want to discuss about already published paper? Is it the methodology or possible extension of the work? Should I try to go in depth about the topic or study techniques? Also what questions should I ask from him in that meeting?
I consider this upcoming meeting as an important step for my PhD position.