Tons of jokes, tons of comedy, tons of fourth-wall breaks and AT LEAST one Max Payne reference.
ALL plotholes (plotditches, in fact) fixed up.
Yakuza gangsters trying to kill you after "Cash in Kazuki's Chips".
VC XBOX-styled rain and blood droplets.
iOS graphics on ALL versions of the game.
Fix ALL game bugs.
EVERYTHING that was cut.
Ability to crouch.
Ability to throw BRICKS at enemies to knock them out for a while.
A black shoe for use as a melee weapon.
Ma Cipriani appearing in person.
Characters behaving differently depending on what Toni is wearing (e.g. If Toni is in his underwear, then Vincenzo will laugh at him.)
Underwear outfit being available from the beginning.
Flyable helicopters and planes.
A PC port.
And maybe more, LCS is already good enough.