Do you guys think that they'll have something like guerrilla warfare for the separatist? Something well suited for maybe stealth based characters, along the lines of sneak-attacks, caravan robberies, and such?

I don't know if you could call them rebels or not. The separatists simply don't want to be weighed down by a crumbling empire. I think they would simply be the same proud Nords they always have been with conflicting views with the loyalists of the empire.

No one can really say yet... for all we know the separatists outnumber the loyalists.

It could be nords who want a unified Skyrim vs. nords who would rather remain as city states.

These are all good points. To be honest I didn't think of all the different scenarios, but, let's say, for the sake of the argument, that it's just imperialists and anti imperialists.

doubt it.

From what I understand, it's pretty much 50/50 in the civil war so I think it will be all out.