That is exactly what it is. No one was buying or playing either hardly, so lump them together and add space Marines and people bought in. Of course it also means half the aeronautica imperialis models didn't make it over because they don't want tau, eldar, orks, and necrons in a HH game. Since most of it is just simplified smaller versions of the HH stuff now, that's probably how they justify it. I do wonder if epic 40k would have actually done better than epic 30k just by having more faction variety in it.