The fourth #August1Warning video says the person is not Bill Goldberg. You can watch it at this link or embedded in the video below:
Eric Bischoff Tweeted the following about the #August1Warning videos:
4am and on my way to Whichita Falls Texas for Impact! #August1warning better be able to "walk the talk". Texas is the wrong place not to.
— Eric Bischoff (@EBischoff) July 31, 2013