| >>Permanently, or will it require re-researching?|
It's temporary - You retain it in memory until you die or change symbioses.
>>Are there plans to gate the symbioses in any fashion?
Yeah, a few of them. Sets of Symbioses will be gated by feats (So the 'Body Matrices' feat will gate body stat buffs, for instance), which in turn are gated by ranks.
>>I'm trying to come up with a way to get it to do the same for Sorcery and Debilitation.
So ideally, the benefits of sorcery and debil are self-evident (the way they are for TM). With the increased durations for debil spells, hopefully using spells to debuff your enemy becomes something people do regularly - Having interplay in the combat system between debuffs and damaging attacks is something that we'd like to encourage.
Sorcery is kind a pursuit in its own right, though. It gives you access to the spells of other guilds, which is a pretty powerful thing. It gates your ability to CAST those spells too - If your Sorcery is low but your Aug is massive, you still don't get all of those Aug ranks.
For now, at least, I think TM, Debil, and Sorcery are in a good enough place that we don't need to enhance them with 3.1. That doesn't mean that there aren't enhancements to RESEARCH or additional Symbioses that could be used to enhance them in the future - Just that right now, they're good enough.