Yah, there a ton of "rendered" stock images of it with detachable cable. Nothing of one from an actual camera. So maybe they had that in the initial design and then scrapped it but still let out of those photos?
Yup, actually, the renders on the Amazon listing for it (with prime shipping!) have the detachable cable, too. I noticed it the other day but was too lazy to mention it. Seems they may have originally wanted to make it like the detachable setup that they have on the 681 EVO (and HD 668B if memory serves me) but they ditched it.