Yeah, Ubi seems to have stated various download file sizes for the PS4 version on its website. That 90-odd Gb figure is probably incorrect; the download will be around 50 Gb, plus a "day one" patch of circa 2bGb, with the total install being about 90 Gb.
This Division 2 page supports this thought.
It's probably fair to say that the disc version is continuing the trend for discs being access keys rather than actual data storage!
I haven't pre-ordered yet... I'm kinda prioritising stuff and I'm not sure that I'll dive in. Battling the hype at the moment.