Just a thought, and to be honest I'm sure there must be a perfectly reasonable explanation...but.....
Since it seems Forgeworld are getting some WD love with the Heresy, could it thus follow they are becoming a smidge more mainstream? I mean, consider also the Aeronautica book, which clearly lists when a given unit can be fielded in 40k, and which are Apocalypse only.
Seems to me that a rational step forward (given the almost certain healthy profit HH is about to bring in...) would be for them to produce (however sporadically) models for the Specialist Games? Perhaps not Epic, which seemingly hasn't worked before, but stuff like Necromunda?