For those of you who have read the small exert near the end of the first Bionicle 2015 graphic novel, you will remember it saying that the Kanohi Vahi (Mask of Time) in G2 is actually only the top half of a mask, or so it seems.
I think that the other segment to the new Vahi would hold resemblance to the 2004 Great Huna. Here is why:
I think it could be the Huna for two reasons. One, I think the graphic novel had a typo (which is not outlandish to assume considering two images of Narmoto portrayed him as being green) and it is meant to say that the Vahi is the bottom half instead. This would make sense because in Bionicle 2 LoMN, when Vakama wears the Vahi, he does not take off his Huna, instead he puts it on the bottom half of his face, leaving the top half exposed. Therefore, the other segment of the Vahi in G2 could very well hold resemblance to the Great Huna.The second reason is simply that it may or may not be a fun little cameo for the Huna to appear in the reboot.
In terms of actually having a physical piece, I am assuming we will eventually get the G2 Vahi, via a guide book (you know, those little plastic things at the bottom of of certain Lego visual dictionaries that hold a minifigure -- just with a mask) or maybe a semi-hard to find collectible. I think the redesign for it would be much smoother, and have the two prongs on the side so it can fit around a G2 head.
These are just my thoughts. Post yours down below.