Considering they're headed by corporations, I cant say I wasn't expecting anyone to swoop in on an arms deal xD

Anyways, I see this as escalating quickly if the royalists decide to call upon the army. They are what I would consider the most powerful faction, as they have influence that could potentially remove the power Prussia's government has... Or rather doesn't have, as the government hasn't even been fully established yet. The nationalists are one of the other major players, especially since they're committed to terrorism. I wouldn't disregard the independents either, they won't remain peaceful forever if people are just going to ignore them, if they feel they are being completely ignored, their members may start to join more extreme elements or found their own.