DC has posted four variant covers on The Source, including Ale Garza’s cover for The Flash #6. Edit: The solicitation credits Ale Garza and Sandra Hope. I can’t read the signatures, so I’m guessing she’s the inker.
The first four issues of the series featured alternate covers that had little to do with the story: the Flash running, or changing into his costume. The fifth (coming late September) will be part of the massive 12-part White Lantern image for Brightest Day. This is the first one to relate directly to the story, featuring the Flash vs. the Renegades.
The Flash #6 is currently scheduled for October 27.