KMOD was planned to be abandoned after 2.2 (there were only very few minor things that would've been changed/added for a newer release, and 2.21 was never released) and this was officially communicated back in June, when KMOD 2.2 was released as the last version of this mod. In the meantime, it was decided upon to release a new version (most probably 2.5) with some of the enhancements from Scattered Evil (most important of them the damage skins for monsters) and the bugfixes from the never-released 2.21, but unless it will contain new bugs, this 2.5 will be even more surely the last version ever, at least based on jHexen. I don't rule out the possibility of a KMOD 3 based on Vavoom, which would enable to implement new things, especially in the multiplayer area. But you shouldn't count on it as IMO our future projects are simply more interesting for both us as developers and you as fans (feel free to express it if you disagree, we make this stuff after all for you all).
While KMOD multiplayer is very unstable and undeveloped, it'll be mainly replaced by our upcoming multiplayer mod, especially the deathmatch part.