I think that, depending on how you do it, you could basically do the current family (minus some less essential additions).
-Robin (Damian Wayne)-Bruce's direct partner.
-Batgirl (it will almost certainly be Barbara Gordon)-Works pretty closely with him as well.
-Nightwing (Dick Grayson)-Mostly does his own thing, but still is close to and collaborates with the others sometimes.
-Red Hood (Jason Todd)-The "black sheep," more violent/ruthless one who has a more tenuous connection to the others.
-Batwoman (Kate Kane)-Pretty much her own thing, and was merely inspired by Batman (as opposed to actively trained by him). But helps out on occasion.
-Huntress (Helena Bertinelli)-Kind of like Red Hood, but a bit less ruthless/violent.
-Etc.
I go back and forth on characters like Tim Drake, Cassandra Cain, Stephanie Brown (incidentally, I feel like Joss Whedon's writing style fits the latter two characters better that it'd fit Barbara Gordon, just saying). I love them, and I'd love to see them. But I don't necessarily trust DC/WB to be able to use/integrate them well. We'll see.