I came across a post from TSCC actor Erin Fleming on her Instagram account, in which she remembers her days on set of the show. She mentions tidbits about what would have happened in season 3.
For the record, Erin played submariner Goodnow - the female who got killed and duplicated by the liquid metal Terminator - in TSCC ep2.18 and 2.19 'Today Is the Day: Part 1' and Part 2.
Here's what she said:
I've never been a body double. I had a body double for the show because I'm 2 characters. The first is Goodnow, a resistance fighter. And then a different and new liquid terminator is introduced who takes my form. This was supposed to be a story line that would've carried on to season 3. Too bad we didn't get to show you the 2 liquid Terminators fight... Oh well
From my understanding, the story line Erin mentions is about the T-1001 ("will you join us?). But then I don't quite get why she mentions a fight between two liquid Terminators. I have always assumed that the T-1001 in the submarine and Catherine Weaver were the same.
On the same topic, check out Behind-the-Scenes photos of the USS Jimmy Carter crew on set of TSCC.