I was having a quiet chat with someone connected to GW (don't want to say who for fear of trouble...) who was talking about Forgeworld and the older marks of power armour.
They mentioned two things of note. Firstly, due to the succes of the older marks of power armour, their are further expansions to this range in the works. No details of what.
Secondly, that now with the Contemptor out, their was sufficient range already, and with the planned expansions, to begin work on a Heresy supliment.
That was all the details I got, and both of these things seemed to be 'on the table' rather than perhaps in pre-production, I'm not sure. Figured I'd share!