I thought orgrimmar wasn't founded until after hyjal? Not that it really matters i guess. They could just kind of save the stuff with jaina coming to kalimdor for a 3rd war movie and just show orgrimmar being built. I pictured the 2nd movie being most of the second war stuff ending with the hordes defeat and the 3rd one all about thrall getting free and fighting to free the orcs from the internment camps, ending with Orgrim dying and thrall becoming warchief. I guess that kind of skips over beyond the dark portal