Guilds
Did they make it in the final release? They were in one version of Beta and disappeared in the next. I liked the idea of special buildings giving access to special units.
Dungeons
Never saw them in the Beta's but, hoped they would be in final version, I mean what's adventuring without dungeons? This would also make Elemental a little closer to Birthright, where champions when adventuring on maps different from the strategic map. Could tactical maps be used for creating Dungeons and be linked with a quest location with the editing tools?
Capture vs. just Kill
The ability to capture/seduce/bribe/kidnape units(beasts, NPC's, other Kingdoms Champions, family members) and ransom other kingdom's champons/family members, never saw this in the beta's but, think it would add another element to game play, too many games use the just kill everything methodology when it come to combat.
Well, I guess we will see soon enough, if these didn't make it in, there's always expansion packs!