No, the interviewer will not know your reapplication status, and unless asked a direct question, you are under no obligation to disclose it.
But I would have thought (depending on how you approach things) that potentially discussing how you have grown and developed since last time may actually lead to a stronger and clearer explanation of how a Wharton MBA will help you achieve your career goals, and what you may contribute to the Wharton experience.
Yes, in hub cities where adcom are anticipating strong demand for interviews slots, alumni and adcom may conduct hub interviews (this is not usual, but it does happen). All interviews are weighted equally, and the person conducting the post-interview review of your application will not be the person who interviewed you.
FF