The reason I ask is that I've read complaints that as it was the first army book, it didn't have much beyond the theatre selectors and a few extra variant infantry and tanks to differentiate it from the main book, whereas the Soviet book has lots of different troops, optional rules, theatre selectors and new army rules, like the Commissars and such.
I think I'll hold off and restrict myself to what's in the rule book for now. As Late War Grenadiers, I don't really need to limit myself on equipment and can go crazy with cheaty assault rifles.