Up until now, there has been little solid info regarding the release date, though there was some rumors and an earlier screen-shot pointing to August 4th. Now it appears that Verizon stores have received official notification informing them that they will receive the Droid Bionic later this month and to have it on public display starting July 29th, and will most likely be placed here. The email also points to August 4th as the release date. It does not give a price, though most believe it will be around $299 with contract.
Hopefully this will all happen, and the Droid Bionic will hit on August 4th, as the it will be the first dual-core smartphone to run on Verizon's 4G LTE network.
source: Droid-Life and Android Forums