DC’s website now shows Flash #5 coming out on September 15, and Flash #6 coming out on September 29.
Flash #5 was originally scheduled for August 18 and has been pushed back several times. #6 was originally September 22; this is its first (and if we’re lucky, only) slip.
Interestingly enough, Velocity #2 has also been rescheduled for September 15. Velocity #1 hit the same week as Flash #3. Flash #5 and Velocity #2 were both scheduled for August 25 at one point, were both later scheduled for September 8, and are now both scheduled for September 15. It’s as if the two speedster series have somehow become synchronized, with two issues of Flash for each issue of Velocity — despite being published by different companies!