A new leak suggests that Konami is going to release a new collection, Castlevania Advance Collection.
The leak was spotted on the Australian Game Rating Board website just recently with an M rating for Fantasy Violence. It is developed by M2 and published by Konami.
Details suggest that it will have dual audio, possibly Japanese and English. Also, based from the title, the games involved in the collection might be from the Gameboy Advance. It could include the following:
Castlevania: Aria of Sorrow
Castlevania: Harmony of Dissonance
Castlevania: Circle of the Moon
No confirmation yet for Konami, so best take this with a grain of salt for now.