I was at a BL event in Dublin 4 years ago at which ADB and John Ffrench pretty much admitted the Scouring would be done. Ffrench in particular said he wanted to explore what Dorn and the IFs do in the wake of the HH.
That's good to hear.
I'd be very interested in how they depict Dorn's refusal of the Codex Astartes and the breaking of the Legions. While we know how it ends, I know the BL writers would give it the proper gravitas that it deserves. Also, would like to see the Blood Angels pulling themselves back together after Sanguinus' death. Oh, and more information on the destruction of Caliban and the battle between the Lion and Luther.