BloodRayne was the creator behind Hexen:Edge of Chaos. He has been working privately on Grimm. Which is a venture into a game that let's go of regular FPS conventions and hack and slash conventions while it dips into platform type gameplay combined with weaponry that is only limited by the skill and timing of the player. Grimm aims to be a hardcore game for experienced players.
Some screenshots for Grimm:Quest for the Gatherer's Key