You've Been Chosen: Nightmare Teaser Posted by BioWare

I honestly have no idea what it could mean, but BioWare has posted a website and a "Nightmare" teaser trailer for an unnamed project, both under the "You've Been Chosen" monicker. It could be either the developer's new IP (under the leadership of Mass Effect's Casey Hudson) or the collaboration with Failbetter Games (of Sunless Sea fame). Time will tell, I suppose, but for now you can check the teaser: