Enhanced Edition is a vanilla based mod which aims to implement as much gameplay related features as possible without bloat.
A attempt to further improve upon native.
Freelancer (Updated version from Floris)
Custom Troop Trees
KAOS Political KIT (Start as King, Prince or Vassal).
Troop Ratio Bar in battles.
Change your kingdom culture and thus your troops, reinforcements and fief scene guards (you couldn't before, just the religion).
Game menus to change various things like party sizes and merchant respawn rates and item count.
All new random Lord creation system (can be turned off in the menus).
Lords can killed, assassinated or executed by the player or other lords (can be turned off in the menus).
Viking Conquest trigger format that increases performance and decreases map lag.
Added Forager Skill.
Factions will spawn scouts, patrols, foragers, war parties, mercenary companies.
Replaced world map textures with new ones from World Map HD v1.2
Overhauled Constable prisoner options: He can now buy prisoners just like ransom brokers, ransom companions, vassals or even friendly lords (10 or more relation) of factions you don't have major issues with (minimum -5 relation).
Added Civil War (if a number of lords get disgruntled by their faction leader, there's a chance they will split the faction in two starting a civil war). Can be turned off in the menus.
Added Viking Conquest improve equipment feature (talk to a armorsmith or weaponsmith in a town to improve your equipment).
Added bodysliding feature from 1257AD
Added lance recruitment from 1257AD
Implemented new improved death camera
Added Permanent Camps
Added ability to make Wagon Trains
Motomaru's Campaign AI fixes and tweaks (lord's take action much earlier in game and are more consistent on their actions)
Quasar's siege ladder pack (2 or more ladders in sieges)
New female face textures
Political World Map presentation under reports
Perfect Troop Trees presentation under reports
Floris Banking System (modified by me to allow deposits with interest + buying land on villages)
Font from 1257AD
Male hair crash (Hair 21) - Fixed in dev build
Tavern townspeople not positioned in right places - Fixed in dev build
Tavern bounty quests are impossible to complete because the fugitive doesn't initiate the fight - Fixed in dev build
Randomly generated lords sometimes have wrong icons on the map.
Can't overswing/upstab with spears.
Name change bug when starting as a monarch.
More details at the Taleworlds thread.