Well out of that bundle only 2 books are for the Wargame (Warmachine:Prime, Hordes:Primal) and they're the old wargame rules at that, 13 for the RPG (2 core rule books (one for the 'Civilised' rpg setting and the other for the 'Wilds' setting) and the rest are an assortment of supplements and adventures), 27 novels (single stories or anthologies), the PC/Mac game and a few assorted money off coupons for things like the board game and LCG.
Hordes are the monster races, for the rpg they are reflected in the Unleashed rulebook - whereas the Warcasters in the IKRPG/war machine can control mechanised 'warjacks' into battle the warlocks in Unleashed/hordes control Warbeasts (monsters basically). In the Iron Kindoms rpg you're playing characters from one of the several civilised nations who use magic fuelled technology (very steam punk) whereas in Unleashed the characters are members of the more wild races who use magic in a more organic fashion.