The last time we saw a leak of the Verizon Wireless roadmap, it had the HTC One launching on August 1st
and replacing the HTC DROID DNA. It looks like there has been some sort of delay though, because a new leak is putting the release for the Verizon HTC One at August 15th. Although, it is unclear what exactly the delay has been.
It is very possible that Verizon simply didn't want to have the HTC One launch overshadowed by the Moto X announcement that will be happening tomorrow, but we can't say for sure. All we do know is that it is very unlikely that Verizon would launch the HTC One without any sort of announcement, and there is definitely no time for that if the device was sticking to the August 1st release date.
Droid Life has also obtained a document that says that the HTC One release has been moved to August 15th, but no reasoning has been given.