From the cover we see Sylvester will be talking Seventh Doctor, and the Radio Times on DWM 486 mention Moffat talking about where Missy might sit in the Master’s timeline (before Simms?) and a good weeping angel. But there’s more!
It seems the Mystery of the Three Capaldis is being addressed and a scene was just about to be shot (in this quote from Steven Moffat):
yes, we’re coming back to that idea. In fact, we’ll be shooting the scene in question really quite shortly…
All good news and there are some details on the new Big Finish Six Doctor trilogy including news of the Rani., Marc Platt, Miranda Raison, Bletchley Park and more. Details on the BF site: DOCTOR WHO MAGAZINE – COVER AND SIXTH DOCTOR NEWS.