Something slipped out over at Konami. It’s some interesting release dates. Among some other multiplatform games were two games for the Nintendo DS along with there American release dates, and these games were:

Death Jr.: Science Fair of Doom – 10/11/06 – Nintendo DS;
Castlevania: Portrait of Ruin DS – 11/15/06 – Nintendo DS

This confirms rumours of a Death Jr. in production and also a Castlevania sequal, no Australian release date as of yet.

Source: 1up