My personal ideal, is for Princess Diana to be the publicly known and acknowledged Ambassador for Themyscira with no secret identity.
When acting as an Ambassador and performing various charitable activities, she would be Princess Diana (or simply "Diana" as she personally prefers) and when engaging in "superheroics" she would be "Wonder Woman".
As an Ambassador, I wouldn't mind it if she had some kind of formal working relationship with the military. Her government appointed liaison may even come from a military background, for example, a certain Steve Trevor.
I don't have any interest in seeing "secret identity businesswoman" Diana Prince. Not only does it seem a little dull, but the whole "working with/for Bruce Wayne, but with a secret agenda" is very similar to Talia's storyline in the most recent Batman film.
But, if the rumours are true, that could be how we're introduced to Wonder Woman. I would just hope that she grows beyond her role as an employee of Bruce Wayne in any future films.