It seems that a collection of Castlevania games is due to be released soon, as Konami has had a game called Castlevania Anniversary Collection rated by the Australian Classification Board.
The official website for Australian Classification has a listing for a game called Castlevania Anniversary Collection, which has been given a PG rating due to mild themes and violence, as well as some very mild bare skin.
The Castlevania Anniversary Collection is listed as a multiplatform title, which makes it harder to guess what the game will actually contain. There was a Castlevania Requiem collection released last year that was exclusive to the PlayStation 4 that contained Rondo of Blood and Symphony of the Night, so it's doubtful that those games would appear on a multiplatform collection just yet.
The fact that Castlevania Anniversary Collection is listed as a multiplatform game also means that we likely won't see the Nintendo games as part of the collection, which makes up most of the early Castlevania titles, as well as some of the amazing portable ones that appeared during the Game Boy Advance and Nintendo DS era.
It's possible that the more recent games from the Lord of Shadows series could make up the bulk of the collection, as they have yet to be released on the current generation of consoles. There are also games like Castlevania: Curse of Darkness which were multiplatform releases, as well as Castlevania: Bloodlines for the Sega Genesis which should be fine to use.
The question we are left with is what the game is an anniversary of? The original Castlevania was released on September 26, 1986, which would make this year the thirty-third anniversary of the game's release and that seems like an odd year to celebrate. It would make more sense if Castlevania Anniversary Collection is going to be released in 2021, which would be the 35th anniversary of the series, but it seems a little premature for the game to receive its age rating now.
The Castlevania Anniversary Collection rating has left us with more questions than answers, but the prospect of more classic Castlevania content on modern systems is always a good thing.