Reissuing of your cards is handled much the same way as it was in the past.  You should receive a Reissue Cards listing from your credit card vendor a month to two weeks prior to the month in which the cards will be expiring.  You need to review as to whether you wish the card to be renewed or not. 

Blocking of cards is done on the CU*BASE system.  All cards that are going to be renewed should have the review date on the loan account updated to match their new expiration date.  All reissued cards are generated by the credit card vendor as per your instruction.