The one slam that doesn't actually need a roof at all has one over two courts. Only in tennis...
Rod Laver and Hisense are multipurpose venues. Rod Laver is generally used for concerts outside of the Australian Open and various types of exhibitions / shows. Hisense is currently used for Melbourne's Basketball and Netball games, and occasionally for concerts.
Margaret Court will be multipurpose too once her redevelopment is completed. It will host Melbourne's Basketball and Netball games and also occasional concerts.
A new show court with 5000 seat capacity will be built between Rod Laver and Hisense (was added to the second stage of the upgrade early this year). From the picture here, it will be similar in appearance to Margaret Court when she was uncovered, though with 5000 seats means it will have slightly less capacity.
(Hisense is the stadium in the bottom right hand corner)
It's referred to as 'Show Court 1' in this video. Hopefully it's called the Evonne Goolagong Cawley Arena.
Looks like Courts 4 to 15 will have their current arrangement changed. Not sure what's happening to Courts 16 to 23 though, I still only count 12 courts in that far corner (not including Show Courts 3 and 2) and that looks like carpark to the north of the new court.
Courts 16 to 23 were also absent on the previous plan though with mainly greenery instead. Previous plan: