
Konami’s unannounced Castlevania collection has been outed again | VGC
Second ratings board lists Advance Collection…

Usually just one of these rating board leaks is a pretty solid confirmation, but this definitely looks like it's happening.
Depending on platforms and release dates, it should be a fun time for GBA fans this upcoming half year, with 2D Metroid, Advance Wars, Warioware, and Castlevania releases all incoming. It's almost a little bizarre.