I dont think they will get rid of Dark Arts. However i do think they will restrict how often you can use it. Maybe even a 15s cooldown.

My guess is that syphon strike will get its DA removed, Quietus will get its DA removed, and Plunge will get its DA removed but keep the bonus enmity generation if DA was used.

I hope they go the route of making it to where all 4 tanks can MT instead of the 2 designated MT and 2 designated OT.

I hope DRK gets that WAR treatment this expansion where all the devs cater to it until the job is perfect, or at least close to the amount of attention WAR got.