You can find the mod and progress pics here: http://www.moddb.com/mods/arx-insanity-mod/
There is a resumed and very short description of features and changes.
The objetive of this mod is offer a variations for new gameplay, new quests, characters, items and new remastered high definition textures, sound effects and code scripting, a short list of changes now finished:
New features on gameplay and new improved very hard mode.
New level: Miguel's fight Arena, available to play as demo intro and in-game side quest.
New improved and more modern graphical appearance, Arx have been remastered with new HD textures and visual aspect, sound effects and remastered soundtracks.
The game is more inmersive introducing new quests, shops, characters, items, weapons, armors and more.
Re-designed levels, new lighting design, gameplay and new features.
A new mini-game: Arx Fatalis Zombies, used to unlock new weapons and special items.
All game scripts modiffied and improved.
New Dialogues and story line.
Introducing new 'elixirs' and special doses, used to heal player, increase mana or attack enemies with new posibilities and ways to go like gore explosions, shrinking, poison and anesthetic doses.
Elixirs
Health elixir: heal player in great scales, available on fx special elixir. Can create a low, medium and strong doses.
Mana dose: increase the player's mana, available on fx special elixir. Can create a low, medium and strong doses.
Shrinking dose: this elixir can shrink player or NPCs, if the a NPC is shrunken, player can crush him stepping on or hiting him with only one hit. Available on fx dose for eternal shrink.
Explosion bomb: very dangerous, on NPC combining, make him explode and spawn a very big gore visors and default bones.
Poison bomb: on NPC combinig, player can create poison explosions, poisoning the NPC to a very critic health state, or in some cases, making a total death. available on fx special elixir. Can create a low, medium and strong doses.
Anesthesic doses: player can make a NPCs sleep, on NPC combining the NPC go to sleep fast, on level reloads NPC wake up again and attack player depending if is or not enemy.
Funny fool dose: player can make NPCs dance, loose control and speak fool dialogues, after several moments, the NPC back to reality, if player is in sight, the NPC will attack, if NPC don't see player after wake up, will be friendly but confused of what happend.
NEW WAYS TO KILL
Player can kill NPCs in new different ways, offering fun and re-playability.
New special ''Shadow Kill'', player can kill enemies with stealth and attacking him behind, do a instant death.
Player can use mental and elixirs to kill enemies and combining different elixirs, make different custom kills.
SOME FEATURES
The game have new 6 different endings, new primary and secondary quests, enough new NPCs on the levels and new shops, there is a new shop of a goblin called Shok, and a kind of rare blacksmith place with new primary character called Alessandro.
New stealth roofs for assassins, player can use this for slide on shadows and kill enemies in places of great height.
Improved and new food system, player can make a delicious pizza!
New weapons: bloody, rustic, luxury and powerful new weapons, player now can make new weapons at the dwarf forge, can make 2 handed swords, long swords, sabers and feather swords and all can be meteoric!
There is a live dwarf on level 8.
Arx Fatalis Zombies mode: player can collect gold killing zombies and unlock new special weapons and secret items
There is a lot of hidden secrets and cheats in the mod.
And it is a very short list, hopefully soon update new changes, thanks!.