How does this new Orc Pit work? Its fairly simple... You build an orc pit, which has 2 expansions. The orc pit can create basic Orc Hordes & Black orcs (Mini Hero Horde) and allows you to research the Banner carriers. At level 2 Orc Pit you can research "Expansionism - Tent" which allows you to build the orc tent, which creates Spearman & Morgul Orcs and allows research of the Fire Arrow technology. The Orc Tent at level 2 can research "Expansionism - Black Tower" which allows you to make the Black tower, which allows you to create Ungol Uruks (Great Orcs)!
So to sum it up... Expansions, but not for your fort!
The final Orc Pit, all structures Level 3!
The Basic setup...