It's been back for awhile. Google "Legions", it was made by the same team from Dynamix that made Tribes 1 and 2.
Yeah, except that's been taken offline for a while, and god knows when it'll be back up.
And great, another random studio making a Tribes game. As if VUG pawning it off to Irrational Games to make Tribes: Vengeance didn't do enough damage.