In the last couple minutes if the below video:Very interesting! Do you have a link to where Crawford said that? I also believe that Evoker and Illusionist are a shoe-in, but I am so curious how they will handle the necromancer specialist with no 5th level spells to collect/scribe (yet).
If they can get a good Necromancer that makes necromancer-players happy (with only 4 subclass levels), that would give me a lot of hope for other subclasses that need to embody a schtick that makes them unique.
I agree that a bladesinging is interesting as an option, but it was reprinted in Tasha's, so I'm skeptical that they will reprint in the 2024 Core rules. It's already good and is a later design, so it doesn't showcase anything new or iconic as a core option. (IMHO).
The thing about Bladesinger is that it is a more popular choice than any if the PHB options, and makes the Wizard play differently. Based on Crawfords comments, they are interested in making the Subclasses offer distinct playstyles.