It's why I love Waller's speech about Bruce in Epilogue.
Speaking of that, what would that make Terry to Bruce in the new comic canon? If Damian is training him, that is. His grandson?
Although of course we're not even sure if this is fully canon. I mean, the friggin' Mutant gang made an appearance, it's pretty much a celebration of everything that makes Batman good, I think.
The only loose end is the scientist dude, who's now loose in time, with 15 years to spare to make himself a worthy villain. If he makes future appearances, means Damian training Terry is canon.