Sure we got small bits of info and lore like from outbreak perfected, but after Rise of Iron it feels like SIVA was just completely forgotten and never mentioned in depth again. I’ve heard people call RoI a filler dlc because it was just kinda brushed under the rug and Aksis as well as the entire storyline of SIVA was just never used/mentioned again. It’s a real shame considering how unique SIVA was as well as the potential it had for further story usage.
-
It's been brought up a few times in D2. Failsafe talks about it, the Neomuna nano tech is based off it. I think it was also brought up in season of the seraph. I suspect it will return as an episode in the upcoming years. In fact bungie even made a siva version of the exodus crash strike, but they removed it before launching D2