There isn’t anything long-form published about them yet, but there are a lot of clues all over the place 
The only bit of fiction that mentions them by name so far is Sine Wave Omega. It’s only a very brief namedrop, but it also lets us know that some people in the cluster already knew about them for at least some time - though that could also be a result of knowing what the true intention of the new Project Discovery was.
Mithra’s Gate also has some clues that all-but-certainly point more towards the Triglavians - the triple-output cloning facility accessed by Sariel using a bit or Trinary Laminar, acquired through talks with a person who was probably Sjakhuni, who’s front-and-center in both Sine Wave chronicles.
For bits and pieces that start fitting together, these & other things would all be good to look at:
Damavik:
Damavik Subclade of Perun Clade revised adaptation schema for cladeship of the 3 tactical troika classification has been accepted for imprinting in advancing-time generations after cladistic glorification over Samovda Subclade. Tactical subrole dispersal is in the gift of strategic troika.
Vedmak:
Vedmak Subclade of Svarog Clade relinquished the adaptation schema of reverse-time accepted 81 tactical troika classification into the cladeflow of Triglav after cladistic mortification by Dazhbog Subclade. Strategic troika have advancing-time pressure for adaptation into tactical subroles.
Leshak:
Leshak Subclade of Veles Clade scattered the adaptation schema of reverse-time reclaimed adapation schema of 729 tactical troika classification vessel into the cladeflow without proving after Convocation of Triglav Outside the Struggle. Convocations of the Commune Troika have now-time pressure for dispersal to strategic troika.
Deviant Automata Suppressors:
Strategic Troika of Svarog Clade sever-dissents from noema that deviant automata may enter sobornost with clades. Svarog Clade now-time affirms imperative of poshlost extirpation.
Multibody Tracking Pylons:
Paramount Technical Troika of Gromovi Subclade evoked the playful communion of repeated-time tactial troika in sub-27 exclave with repeated conduit loop construct-9. Upflow of metaxy to Perun Clade evoked acceptable grounding of material realization in advancing-time of tactical casting and reflection across arbitrary response units.
Triglavian Automata Command Pylon (not yet encountered):
Convocation of the Troika of the Vodya Subclade of Veles Clade divined purpose for the deviant automata in the flow of Vyraj. The Koschoi of Vodya made a casting that the winnowing of the clades would be served by turning poshlost to sobornost. The Navka of Vodya gave this noema profound reverse-time sense and grounded the metaxy. The Narodnya of Yodya accepted the volition and merge-consented in the Koschoi and Navka of Troika Vodya. With this scribing is the working of the flow revealed as law.
DED Monitoring Stations Warn of Increased Rogue Drone Activity; Possible Rogue Swarm Feared
–With the Navka in the Abyss, it seems likely that some Swarms could have Triglavian roots
SOE Splinter Group Claims Timebase Mission a Cover For CONCORD Anti-Drifter Experiment
–Taya Akira’s disappearance/kidnapping/rescue by a Rogue Drone points to Triglavian involvement
Mithra’s Gate
– Many clues, including a strange cloning facility with tripled outputs
I’d also recommend reading Theodicy, and (if you can) Templar One, and probably Empyrean Age between those two as well to not lose the timeline. Nothing’s confirmed yet, but there’s a lot that points to some connections at least being possible - as you saw with that other post of mine~
You can be sure I’ll be posting things as more comes into the spotlight - till then, we can only speculate