I'm really really looking forward to this. I love the Flash, and lately I've been LOVING Barry. I'm starting to like him more than Wally (I still love Wally, but his kids have really hurt my enjoyment of him).
Johns is by far the best writer DC has (at least IMO), and his original Flash run was fantastic. I have a feeling that this book will be awesome. I don't think Flash: Rebirth is that great, but I think that's because it all seems like setup. Once that's over he can get into doing more characterization.
I absolutely LOVE Manapul's art, and having him on this book will be a big bonus.
I had heard a few months ago that the new Flash book was going to be called All Flash and star Barry and Wally, was that just a rumor? Does anyone know what's going to be going on with Wally? Also, isn't there going to be a Kid Flash book as well? Personally, I think in addition to The Flash and Kid Flash books there should be a book called Flash Family that stars all the DCU speedsters (Barry, Jay, Wally, Bart, Jesse, Irey, Max).