Final Gear's future maybe bleak with its ongoing maintenance mode, but all of sudden we got this kind of stunt out of nowhere! which seems very random for a Gacha game with the state of Final Gear. So long story short, Artery Gear appears to be getting collab with Final Gear in near future with nothing much revealed so far other than Corallium in her Human and Brain Jar form shown up together.
From what I assume is that the collab event will have Final Gear units making some appearances in Artery Gear with Corallium is probably being the one confirmed for now but characters like Evelynn, @16 and Dango would have good shots due to their character traits that would make collab characters for Artery Gear. Personally I won't be coming back to Artery Gear even with this collab and don't expect anything much with current state of Final Gear. But I do hope this collab would help Final Gear series if they ever plan to resurrect themselves in some way, ideally with a new game considering the current iteration of Final Gear will take so much work to make the game appealing for new players.