Today I was able to schmooze the ladies at the VZW counter for the unofficially official Niagra release date: May 9th. They told me they had gotten that little bit of information handed down from corporate in some sort of pre-release information sheet they can access as an employee of Verizon.
This is a direct quote from the lady at the kiosk, "I'm not supposed to tell you this, but May 9th."
Enjoy Crackberry nation!