Since the steath fighter is already ingame I'm pretty sure it will be used in WiH2.
And there already is one in-mission jump in WiH1, though granted it isn't tactical or anything, just a short hop to a place were Laporte can train with her (not so) shiny and (not at all) new Kent and get's ambushed by those elite Nyxes.
As for Shivans, I doubt they will be in, unless there is another nightmare mission, that fore-shadows BP3, since the team said time and again they want to have the GTVA-UEF war resolved before without any outside interference (Vasudans are part of the GTVA and thus probably don't count as "outside").