Assuming Gotham gets to go its desired distance, Reilly outlines a structure where "the show will arc Bruce Wayne from a child aged around 12 into the final episode of the series when he will put on the cape".
Causing chaos in the city's shadows will be nascent versions of The Joker, The Penguin, The Riddler and Catwoman (no doubt amongst other mischief makers from the Bat-canon). “We will see how they get to become who they are as Gotham is teetering on the edge,” Reilly said. “It is an operatic soap that has a slightly larger-than-life quality.” Slightly?
The series certainly isn't part of the Christopher Nolan continuity, and it's also already been suggested that it won't be beholden to the comics either. So it'll be interesting to see how it deals with all these beginnings, of which in many cases we've already had multiple versions. The Joker in particular, we'd suggest, will require particularly careful handling as a character who's arguably stronger without explanation. Will we see him as Red Hood? Will he be named?
Still more questions than answers at this stage, but the show is developing swiftly. There's every expectation that Canon's pilot will certainly lead to a full series, and Fox will be opening and populating the series' writer's room in February, whence Gotham will be mapped. Expect some casting stories before too long...