There aren’t many definite answers regarding how it would work, but one thing is certain. The game, when it arrives, will not be a port of either of the already existing games. In the words of Carrier: “I don’t believe that games could be ported on VR at the moment (…) They have to be thought about thoroughly and it has to be created for VR.”.
What can be expected is a journey through fascinating locations, like Dishonored’s iconic Clockwork Mansion, with Blink (short-mid range teleport) as the main method of transportation. If the experience will be comparable to Batman Arkham VR, the project’s fate may be worth following.