I'm not sure what "confirmation" of a rumor would mean, but I think you're going to have to wait until I/O to find out. Personally, I doubt it, but that's only a guess. Verizon absolutely HATES Nexus devices. This was made very apparent during the Galaxy Nexus. They don't want a phone in there line up that they are not in control of (updates and bloatware).
Except for iPhones, of course. I don't think Verizon will have a Nexus 4 either, and it also doesn't need the N4. Verizon's draw is their unparalleled network, but we'll see what happens when the others catch up.
The rumor was that there would be an LTE version. No other details, but the assumption is T-Mobile and 'maybe' AT&T bands would be supported.
I could see hope for a Nexus 5 though that supports VoLTE, IF Verizon's LTE network is being built on an open LTE standard. If it is, people may be able to bring their own Nexus 5 and get a Verizon SIM card.
I don't understand why people do not get the major difference in this common Apple analogy...Apple makes 1 phone, and any carrier that wants to have it is forced to comply with Apples desires. Android makes, what 20...50...150??? different phones. It's easy for any carrier to decide they have no desire to comply with the Google over a single device (the Nexus). Not having 1 Android phone will effect their overall business by very negligible amount. Not carrying the iphone would effect their business in major way. It's an invalid comparison.
All this is true, but there is also another reason Google doesn't want to enter negotiations to force carriers. With the Nexus 4, Google's strategy has become pretty clear: offer an inexpensive but top of the line (at the time of release) device that consumers can take to any carrier they want (at this moment, that means GSM carriers). Apple works with each carrier to get their agreement to Apple's terms. Google wants to cut the carriers out of having to do anything with the phone at all (except perhaps sell it). That's why there is only one version of the N4 (storage notwithstanding) as opposed to carrier specific iPhone versions. Ultimately I see Google's vision becoming the successful one here, as most of the world already operates on that model. When American consumers catch up to this, Verizon and any other carrier that wants to remain relevant will be forced to change their business model, not by Google but by consumers.