Rumor mill time.

According to a Whois search, Konami has bought Castlevania-mirroroffate in both .com and .net forms. Their last game, Lords of Shadow, was developed by Mercury Team, and could potentially be working on the game due to fan reaction of the game. As of now I can't find a single shred of evidence as to which system the game is going to be heading to, but fan speculation is that it's going to be a 3DS title. If this is true, the Metroid-Vania style that we've seen in previous DS titles could be making the transition to 3D.

Be sure to check out E3 Jun 5-7 for more info.