Each faction still has its own specialty (nords use almost no cavalry while khergits have very little infantry) but can choose between several roles - defensive (shield) and offensive (2 handed weapon) infantry for example.
If they succeed, a new faction will be formed and behave like the regular ones. All of them can form armies and attempt to take a castle.
The goal of this mod is to considerably improve the Native game, through the use of Floris Mod Pack as a base, which is already a great improvement.
In order to play the mod, you must download v0.5 (which contains all the textures and models used in the mod), then v0.6 (it contains the new musics) and finally v0.62 (the latest patch).