it could be a the Lumenith Situation, But i rather GW didn't set that precendent that every new release of their have a second part a year and a half later or so.
Atm, Kruleboyz does seem a bit hero heavy and feel like there a lack of troops and units, but as a whole there is a lot of models.
they did say that there was more Orruk news to come at the end of the new article but who knows what that means in the end,