Well this one has been brewing since July...
Marvel has confirmed that Benedict Cumberbatch is now officially playing Doctor Strange! As mentioned, the Hobbit and Sherlock actor has been long rumored to be in negotiations for the role since San Diego Comic Con. Marvel President, Kevin Feige has had two previous opportunities to announce this casting, but it seems the deal only just now went through.
Cumberbatch is not the most inspired choice for the role. Joaquin Phoenix had previously been in contention to play the Sorceror Supreme. This is perhaps Marvel's most obvious casting choice since Robert Downey Jr., but that has seemed to work out pretty well for them.
Doctor Strange will be directed Scott Derickson, with a script by Jon Spaihts. It will be released November 4, 2016.