the launch box contents will probably be the 2 spearheads + an extra unit or two for each faction, like with leviathan, or they drop the extra unit sprue in favour of terrain like some have suggested. In the spearhead article, they don't call the existing SCE spearhead the SCE spearhead, they call it Yndrasta's spearhead.
Edit: nevermind they outright stated there will be terrain in the launch box, so it's probably just 2 spearhead forces.