Technically, the two are termed "A" and "B". I wonder whether they'll call the ones at the Cape C and D or repeat A and B, with an "LC-39A" prefix.And speaking of the next launch site, lots of concrete being poured at Stage Zero #2 and tower footings have arrive at the launch site.
Random factoid: SpaceX's lease of LC-39A ends on April 14, 2034. Not that I'd expect NASA to disapprove renewal in 2034.