You shouldn't take expansion patterns of EB1 as a guide as to what is going to happen in EB2. M2:TW offers more settings and a comparatively more clever strategic A.I., so A.I. expansion is going to be more sensible. Not to mention that there will be more factions that can influence the expansion of other factions.

Even so, there are not going to be multiple Roman factions, in the same way there are not going to be multiple Carthaginian factions to direct Carthaginian warfare operations.