Business is about profit, and unless their margins are higher on these two over the GNex, all they are doing is cannibalizing profits from the GNex in favor of the other two - i.e., the total profit off these three remains constant no matter when they release. And I would venture to guess that the profit margin is about equal on these three phones.
They actually do have a higher profit margin on the Rezound and RAZR. Verizon receives money from the apps that come preloaded on the Rezound and RAZR. So Verizon actually loves the fact that the RAZR and Rezound users are forced to have Let's Play Golf 2 (or whatever it's called). Not to mention with VCAST and everything else loaded on the R/R, they're hoping to score even more money from you.
I too believe the date is going to be the 8th, but I also think it is smart for Verizon to attempt to unload some stock before adding on another new device. This is just from the business angle. From my angle... I want it now!