Re: Robin or no Robin?
As for the Robin argument in the next film, I would say have Dick Grayson, around age 15-16, but not as Robin. I wouldn't have him wear the Robin suit or be Batman's actual "sidekick" until he's around age 18-19. I think it would lead to a more believable development for the character, and could push through his maturity complex quickly and lead to a Nightwing spinoff (which would be my plan).
First film is just Bruce. Second film he meets Dick, takes him in and begins his training. Third film he takes the role of Robin and, in the end, leaves to pursue his own legacy, Nightwing.