A Steam Community announcement has word that a beta patch is now available for Resident Evil Revelations 2 / Biohazard Revelations 2 to enable the split-screen co-op feature missing upon release of the first-episode in the new series. Here's word on the patch, which is actually now available for those willing to risk a beta:

Soon we plan to release a beta branch on Steam which will allow two players to play the Story and Raid modes locally via a split screen. We want to get this feature in the hands of our PC players as soon as possible, so this option may not be 100% polished when it is released. Feedback from those who try it out is welcomed. For anyone who isn't satisfied with this option, refunds are available through Steam.