It's official: Trevor Belmont is coming back, and his next Castlevania adventure will call Nintendo's 3DS handheld home. The June issue of Nintendo Power confirms that MercurySteam is currently working on Castlevania: Lords of Shadow - Mirror of Fate (yes that is a ridiculously long title), echoing a recent rumor that the original Lords of Shadow dev was working on some kind of sequel.
A bunch of bullet points about the makeup of the game are laid out in the report from GoNintendo, alongside some very rough-looking scans of in-game screens. It looks like MercurySteam is sticking to the 3D brawler gameplay that marked the studio's previous Castlevania console release. Traditionally, portable Castlevania titles have sported a 2D presentation, but the 3DS obviously offers a bit more in the way of processing power.
I'm sad to see the 2D style go, but MercurySteam did solid work on the console Lords of Shadow and I'm willing to give the team the benefit of the doubt on converting that into a portable experience.