Here's what I think about X3 coming to Verizon. Look at Lumia 950 and 950 XL as the model. Rinse and repeat as needed.
I am much more optimistic as Lumia 950 and 950 XL was "consumer" and HP Elite x3 is "Enterprise and Governmental" large global and national deployments" = enormous "number of units involved"! Verizon is a publically traded company and they must answer to their Board and stockholders "if the HP Elite x3" has a large amount of interest.
The sales guy from HP stated that "large evaluation pilots were in the works" as I would expect and they "can NOT all be just AT&T"?
Personally, I wish that HP and Microsoft just went the 700 Mhz FCC certification route and told Verizon "we don't like you either"!
It's just business !