Perhaps Bruce has been Batman for 1 year, to the day, prompting him to reflect on what he has done. (or perhaps discussing it with someone. A young inquisitive Dick Grayson?)
We get different flashbacks from Bruce's early years (covering different things than BB did).
-exploring his decision to be 'reborn' as a Bat, examining his Bruce Wayne/Batman identity, his unhealthy complete devotion/obsession; how that relates to his Detective Skills; flashbacks of his 'detective' training/mentor, etc.
-The name also clearly establishes the reboot I think.