Didn’t realise it was releasing so soon - 16 May!
Luckily this one might have received a different approach to development than the Arcade Classics Collection. According to Konami Europe’s press release the emulation is being handled by M2:
The Castlevania Anniversary Collection is part of KONAMI’s 50th anniversary celebration and compiles titles from its beloved franchises and retro games. To bring the Castlevania Anniversary Collection to life, KONAMI partnered with game developer M2 to expertly adapt these classics for modern gaming systems.
But it’s still hard to tell what to expect other than good emulation - I get the impression that’s all M2 were contracted for, and the front-end may be similar to the Arcade Classics Collection given the passing mention of a Bonus Books section in the press release. Did anyone have the Arcade Classics Collection? I’m curious as to whether the front-end is some Unity engine overlay - the Switch’s home menu’s intellectual property notices feature should reveal that.
The list of games has been given as follows:
Castlevania III: Dracula’s Curse
Super Castlevania IV
Castlevania II: Belmont’s Revenge
Castlevania The Adventure
Castlevania II: Simon’s Quest
But there’s no mention of whether all possible variations of those games are being included in the package. For instance, the FDS version of Castlevania III alongside its NES adaptation, and GB Kid Dracula to join its Famicom counterpart. From what I recall the two GB Castlevania games also received colour makeovers for the GB collections later on.