Update: NeoGAF member “Santiako” is adding more details to the rumor. Mirror of Faith features 2D gameplay similar to what was produced on the DS. However, Mercury Steam is making the game rather than Konami. Konami will still be publishing.
It seems that Konami will be announcing Castlevania: Mirror of Faith, a new 3DS title, at this year’s E3. The news apparently comes from the company’s appointment schedule for the event.
Gameplay information is not yet available. However, Castlevania: Lords of Shadow producer David Cox and director/writer Enric Álvarez are supposedly working on Mirror of Faith.
Take this with a grain of salt for now. It would certainly make sense to bring a new Castlevania to the 3DS though.