The mod author made a post yesterday at DOOM 3 World announcing that no further development would go into FMJ, at least as far as DOOM 3 is concerned ...

Oneofthe8devilz: I just wanted to let you know that any work on the mod has been halted...... The reason for this is that I recently started to play heavily around with Battlefield 2. Since it already has all the things (like ground and air vehicles, the general nowadays military system, weapons and hierarchy) that I always wanted to get into FMJ..... All it just takes for me to be really happy are some minor changes (like ballistics, blood effects and general weapon balancing)... Another reason I like BF 2 so much is its excellent Stereo 3d compatibility and I think together with its huge multiplayer base (compared to the non-existance Doom³ one) I will be able to get more ppl playing it..... Nevertheless i am very grateful to all the ppl that helped me get FMJ that far.... I still frequently visit this awesome forum and hope it will serve others in the excellent way it did me I had a great time with working on this project and it helped me much to understand what comes into creating a computer game, especially since basically I was working completely alone on this..... P.S. The BF 2 Related Mod will take over the FMJ name so in case you are interested, keep your eyes open for "BF2 5.56mm Full Metal Jacket" since a new website is going to launch soon........

Link: http://www.doom3world.org/phpbb2/viewtopic.php?t=7644&postdays=0&postorder=asc&start=180