Yeah it's even in her official artwork for project x zone so I feel they would have to implement it somehow as well. I mean we have the Monado already so it shouldn't be too hard.
Also... I'm sure we discussed KOS-MOS's gimmick already but I think I like Luxin's boosting mechanic best just like the original Xenosaga games. If they were to have Hilbert effect as her gimmick I feel like it could grant buffs or maybe even heal like Xenoblade 2. Personally, I'd like it to be part of her moveset or maybe taunt instead though. I feel like a perfect trailer reveal would have to have her come out of her vector pod like in Xenosaga Episode I and Xenoblade 2
Xenoblade 2's version is a bit less intimidating because KOS-MOS Re is meant to look like a magical girl but how awesome would it be if KOS-MOS gets out of her pod all badass and then her splash screen reads: KOS-MOS Reactivates!