http://tremulous.net/graphs/If this does not read 'zero' then it isn't. We're (still) dying though.
Maybe trem's got so boring people only like hvh games nowdays.
I do mod trem still though, I have a sad life.
http://www.youtube.com/watch?v=XPGpruGdmok&feature=youtu.behttp://www.youtube.com/watch?v=0MoBJNp69PgThere are other games out there that are based off tremulous, such as Unvanquished (forked off TremZ, TremZ had serious copyright issues, done by Volt, you may remember him) and Murnatan. Murnatan was originally called Tremulous2 but was renamed due to licensing issues, and was initiated by Rotacak.
Murnatan (with trem2 assets, I haven't seen any new ideas popping up that aren't tremulous-related) looks good but lacks the game. It is being developed on the Unreal engine and has "paid" (not sure anymore) developers. They're lacking funds now though due to the copyright issues and the lack of support.
Unvanquished has a game but somewhat lacks visually since we're still on the quake 3 engine (ish - actially a fork of the openwolf engine, a mod and fork of the E.T. engine).
As for Tremulous GPP - It's R CZ/Edge's zone now (I think EDGE was brought down actually haven't touched gpp for a while) and the official servers are down.
So 1.1 is the main gameplay center these days.