Verizon is the only source that matters. The only PUBLICLY released information is the PDF on their website that is in the OP of this thread. If you look closely - NO DATES!!! The dates that we received were from LEAKED photos of Verizon's internal computer system - so while that may have been the INTENDED release schedule the 1,000 test user updates did not apparently go very well, so that schedule was delayed.
While many dates have been thrown about and there have seemingly been several official announcements of the impending update, there has NEVER been a firm PUBLIC release date provided by Verizon.
That is not to say that the confusion around this update is not mostly to blame on the players involved (mostly Motorola and VZW via facebook/twitter posts). IMHO Motorola should not say a single word about any update and refer everyone to VZW for information on timing of updates. VZW should not let any of their facebook/twitter posters publish any dates whatsoever. It should all come from corporate on their own web site. Of course, they can do nothing to stop employees that choose to leak company confidential information (except fire them if they get caught). This last reason is why the store employees never know about an update until it is actually rolling out. My company never informs field personnel of software updates until the disks are actually shipping to try and limit this kind of stuff from happening.