Dynamix' Dave Moore updated his .plan with what he's working on for TRIBES currently, with an update on the status of the OpenGL code, which, as he says, did not hold up the release of the 1.3 patch (next story). Additionally, among the subjects covered in Dave Meddish's .plan, is a bit on TRIBES II:

As of now, the Tribes team is starting to ramp up for Tribes II (or 2--personally, I prefer the Roman numerals), deciding what we can cram in for the sequel. We'll no doubt have some things that didn't make it in the first game, and some wondrous new things as well.