It really started a few weeks ago when pictures occasionally surfaced up until that point of the figure on display at various shows with the MoS sculpt, and then culminated when HT posted this photo on their FB page:
Since these upcoming releases photos generally illustrate final products/production figures, everyone was worried that this was really going to be the final BvS Supes figure with a recycled MoS sculpt. Admittedly I was concerned, but I really had a difficult time believing HT would actually do that at literally the last second after advertising the figure the whole time as having a new sculpt.
A day later after the backlash, J.C. Hong himself stated on FB that his newly developed sculpt did indeed get approved and confirmed that BvS Supes will feature a newly developed sculpt (presumably the same one shown at Toy Soul in December and occasionally at the HT Secret Base), like the specs for the figure specifically state and have stated since day one.
Apparently, despite the figure initially showing a new sculpt and J.C. Hong confirming that his sculpt was approved and the figure will indeed feature a new sculpt and the fact that specs for the figure have always said from the beginning that it will feature a new sculpt that is accurate to his look in BvS, people are still dubious and worried. Almost a "pics, or it's not true" type thing.