Tim Drake, as Red Robin, can arguably take the place of Nightwing in both the publishing line up as well as a similar position in the Batman "family" as the kind of outsider that is still part of it all. Depending on the direction Batgirl takes, it could replace Robin as the teen-centric Bat book while Gotham City Sirens is the villain-centric book replacing Catwoman.
Of note, there is not a Birds of Prey-like book, but Batwoman's starring role in Detective Comics is more of a new book than really replacing a pre-Battle for The Cowl book, and you could possibly consider Streets of Gotham as a replacement for Gotham Central.
All in all, if DC actually wanted to move the Batman concept forward, which they obviously don't from a marketing and licensing standpoint, but, if they did, they would be in a pretty good position to do so with Batman: Reborn.
As everyone is well aware, $4 is slowly becoming the average price for a single issue from Marvel nowadays and the prices of their trades has been slowly creeping up as well, to the point where I have to "do the math" to see if I'm getting a good enough price to page count ratio and, when it comes down to that, it's honestly just not worth the effort.
The first arc, Superman and the Legion of Super-Heroes, reestablished the original Legion and Superboy as part of Superman's history while the second arc, Brainiac, reworked the history of both the titular character and the Bottled City of Kandor.
Both of these arcs are pretty decent stories in and of themselves and you wouldn't notice the retcons unless you were already aware of the various continuities Johns is dealing with and, even with the obvious retcons, like with Brainiac, it doesn't get in the way of the story. Basically, they are part of a story that isn't dependent on the retcon for it's existence.
Of course, there could be more to Secret Origins than that, but, given Johns work on Green Lantern: Secret Origins, which just added one or two minor Blackest Night retcons and did nothing else really, it is always a possibility. The changes that Johns made in Superman and the Legion of Super-Heroes are obvious and I don't see why there is a need to further expand on them. I guess because it's part of Superman's origin, but, even then, I still don't think it's something that is needed.