It’s official: J.D. is coming back. After months of behind-the-scenes negotiations, Zach Braff has officially signed on to reprise his role as John “J.D.” Dorian in the long-in-the-works Scrubs reboot, currently in development at ABC. The project, helmed by original series creator Bill Lawrence—though he won’t be writing or showrunning this time—is inching closer to…