According to Heroic Hollywood, Rachel McAdams (Mean Girls, Red Eye, True Detective) has been offered the female lead role in Marvel's Doctor Strange alongside Benedict Cumberbatch as the Sorcerer Supreme. The site makes no mention of which character she'd play, but if it's Strange's love interest then one would assume it's Clea, or possibly Morganna Blessing.
Of course even if McAdams has been offered the role, there no guarantee she'll accept - but if she does sign on she'll also join Chiwetel Ejiofor as Baron Mordo, and Tilda Swinton as The Ancient One.
Scott Derrickson is directing the film from a script by Jon Sphaits, and shooting is set to commence in London this Fall. Doctor Strange will hit theaters November 4, 2016.