https://www.cnet.com/news/motorola-may-announce-moto-z3-with-5g-moto-mod-this-week/

That's the recent speculation about the company's upcoming announcements for Thursday, according to The Android Report, which also claims it will be exclusive to Verizon and that it will supersede a Z3 Force this year.

5G is the upgraded wireless technology intended to improve on the speed, coverage and responsiveness of connections over the current 4G LTE. It's not clear if you'll actually be able to use it for making calls, though it would likely be welcome for fast data transfer. Existing Mods include the Vital Modo Mod, Livermorium Keyboard Slider, Hasselblad True Zoom camera and some batteries.