The only way to know for sure at this point is for someone to get a production unit and try it out. It's true that it won't work on CDMA networks no matter what, but that's not a huge deal really. Even without CDMA, Verizon is fully equipped to support this phone.
All of Verizon's LTE bands are supported
Verizon already rolled out VoLTE for calls & sms
All Verizon plans have free roaming included so you can use AT&T & T-Mobile's networks to fill in whatever gaps may exist due to the lack of CDMA
The big question is, will Verizon activate it? I think they will because I know they've activated other unlocked phones that they didn't explicitly carry. I've also talked to my local Verizon store manager and he said they'd be happy to activate any unlocked phones. He did however suggest that I make sure I can return the Lumia 950 in the event it doesn't work. Anyways, once the production units are released, we should find out once and for all whether these phones will work on Verizon.