As far as we know, there is no new Tribes game planned.
Tribes 1, which is coming to the instantaction platform on
www.playtribes.com is planned to have zadmin (I believe), which should cover 1, 2 and 3.
4 I believe is covered under normal Tribes 1 anyway.
5 I'm not sure about.
6 may be planned for the future but isn't confirmed.
1, 2, and 3 were covered in base Tribes already, no?
why tribes and not tribes 2 or tribes: vegeance???
T:V is, eh, 4GB? 5GB? No fun to download that, and fewer people would play it I think. T2 probably couldn't be chopped down to a whole lot less than 500MB, which isn't obscene these days but would still bring up the previously suggested question of "Why not Tribes 1?". Tribes 1 is notably smaller, and requires less powerful hardware (Although the exclusion of software (and glide?) rendering is a minor disappointment, as some folks who don't have access to newer, OpenGL compatible video cards won't be able to play it with the OpenGL-only thing going on)