It has been quite some time since the last big release of a Painkiller game. Mods coming out rarely. Who knows maybe there is gonna be soon an announcment for Painkiller 2.
Russian fans disagreeing to wait that long. They started to develop a new mod for Painkiller, but on a new Engine not the rusty PainEngine. At the beginning they had a lot of problems with programming and other things. Have a look for the first screenshots.
The Team is still searching for help, as they are just a few working on the mod. So if you want to help them, write a comment with your contact details.