Well we still should not forget the Artifact due as it currently seems the Artifact resembles no system we know or where it really could fit into. For the Mantis Homeworld it seems to give a complete separate System where they reside and with only their planet and nothing else.
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I still say that the interresting part of this Artifact is that a planet that seems to have a moon is in a triangle that points into the sun like indicating that the planet is hidden inside the sun.
Maybe the access to this planet can only be obtained with the Ancients and the Wormhole but they keep it currently shut due of the Mantis. So the chances that another system might come are still given where the System has at least 3 (maybe even 4) planets rotating around the sun and 1 hidden in the sun (interpretation of course given the picture).
Also considering that it gives definetly more then just 1 Hive as we have seen in the stream it indicates that somewhere out there eventually other Hives who continue the invasion of the Mantis so potential for a continuation or maybe even a rndm Event ala "Invasion of a Mantis Hive" are a thing where in a rndm System a Mantis Hive will appear and we have to do Missions to repel this Hive and get rewarded for this by destorying certain sturctures (Repair Dock, Energy relays, etc.). During those Invasion times it maybe even a thing that on the planets in the system more units spawn then normaly or on the planets rndm "Invasion Events" happen as well where Pilots get rewarded for participating in those Events. Maybe as small extra the Units of such an invasion could drop the average Cryo Amount x2 and eventually when a Pilot has access to Siri have a chance to drop Ancient BPs of the invaded system.
Another thing that needs to be considered as well is "Will it give Ancient TC BPs and if yes how will they be implemented?" Simply added to the current Pool of drops or will SSG add another Ring with extra challenging units?