They haven't shown an intro/opening credits in the past two episodes, so maybe they're going to do the 'names-over-the-opening-scenes' thing for a while. It would allow them to preserve the secret by having the typical opening names/stars, with "...and Elaine Hendrix" at the end. Unless you're really into the BTS stuff like we are, you aren't going to know who she is just by seeing her name. Then again, some dummy might decide to write "...and Elaine Hendrix as Alexis Morell Carrington" in huge, capital letters at the end of the opening credits just to ruin the big return/cliffhanger scene.