He'll get a new expiry date. Credit card companies don't issue you a new number unless they really have to (card was use fraudulently)

Instead they just issue you a new expiry and CVC - and often even update merchants who are charging you on a regular basis with the new info, or allow transactions to continue to go through even with expired date/cvc

Still a valid concern regarding the card # being replaced due to fraud. I keep an encrypted list of all my past CC #s for this very purpose: Far too many places use the CC# as a life-long immutable number (think SSN).