Well I base it on 15+ years as a Verizon customer who seeks specialty versions of phones for them, which means you will see a DNA2 or something like it come along, there is rumors of a Butterfly2 already. Either Verizon or HTC (forget which) posted it was not coming but quickly took it down. Now that could be because it may be coming, it wasn't supposed to be commented on or its not and Verizon "does not discuss their future device plans" or something along those lines.
More to the point, I base it on the rumors, opinions of many on the net and ultimately that unless HTC is willing to design or accomodate Verizon in some huge way it likely won't happen. Of course pigs do fly, drive cars and talk (see Max the pig on Geico).