so any new mods or additions to this game other than unplayable coop?

i wish they'd just convert those coop maps into single player ones.

anyways are there like mods out for this game? this game came out like almost 1 year ago right? that's how long i've been playing. i want to get some new weapons or maybe new character models and skins for the game. maybe even a new single player map.

have they released mod tools? or have people just not been able/want to make mods?