You know Nintendo 3DS. A new handheld which can produce 3D effects without the need for any special glasses.
http://en.wikipedia.org/wiki/Nintendo_3DSI'm sure Igarashi Team are working on a game for Nintendo 3DS. All Nintendo handhelds have Castlevania games, and 3DS will have, too.
I think something new 3D gameplay add-ons for 2D Castlevania would be great.
Just like this:

The view from right and left are different.

How do you think? Does it work?


Maybe you have better idea for using 3D screens.
And don't forget:
Gameboy graphics = NES graphics
GBA graphics = SNES graphics
DS graphics = N64 graphics
3DS graphics = Gamecube or Wii graphics.
I want "Symphony of the Night 2" on 3DS!