Worth the price of admission, but above that...
Flash: Rebirth #4 reminds me VERY much of Green Lantern: Rebirth at this point, which is both good and bad. It's GOOD because Green Lantern: Rebirth was terrific, but BAD because, well, it's just like Green Lantern: Rebirth.
One-page spreads reveal supporting characters returns! The villian explains the plot in precise detail! I was anxious to see if Sinestro ran in a panel and said "HEY, that was MY line."
Regardless, it looks like a new/old guard is returning to the FLASH mythology. Let's just hope DC doesn't leave Barry Allen standing in the shadow of Hal Jordan for his long-awaited return.