@flammable
some guy's tossed around the idea of modding SC4, but nobody actually worked on a tool to get models back in..
I thought the models would be all broken up, since the sc4 engine is soo customizable.. but actually no. the models are all together, most of them completely un-optimized.. so like nude meshes included with clothes all as a single model package.
so theoretically YES sc4 is moddable. though I'm not that into modding it, that I'd trying to create my own compiler.
a compiler means to make or author a new file that will work for a specific system..
anyway since someone already made tools for SC2, its easier for me to just import models into sc2.. even sc4 models and putting them into sc2. just because my background is stronger in 3d editing.
I've tried to contract out to have sc3's models hacked. this way I can obtain SC3 models, and have them brought into SC2. making sc2 quite awesome content wise ^_^
only draw back about the sc4 models, is the annoying material system it uses. I had to write down all the colour values from in the gme, to get the colours right. the textures are white by default, and coloured actively by the game engine. quite impressive really, but makes utilization of the resources a bit of a pain.
@PAVGN
sure thing, but you'll need to have a modded xbox1. some guys apparently can play copied xbox1 games on there hacked 360s.. but still you would be best with a modded xbox1.
the game uses a more complex skeleton for its characters, so you can add alot of dynamic characters.
one of my early tests, was getting in kasumi from DOA

it takes alot less time to get a character into SC2, then forming a character into brawl.