What he says is “I wish we had more time.” before he tells her he loves her and literally runs to his death. That’s it. Nothing that could possibly make her feel guilty, nothing that could have seemed like he regretted anything. Not “I wish we hadn’t gone to the front.” Just “I wish we had more time.”
And he then, metaphorically and literally, gives her more time. Because he knows his clock has run out, but that doesn’t mean hers has to… so he runs and saves today and gives her his watch. Gives her time. (x)
“Wonder Woman can be very charming and warm and have so much compassion and love for the world. She can be soft and naive. At the same time, she just happens to be this demigoddess who can beat the shit out of you and can be a super badass and smart and confident. Ultimately, she’s very relatable.“ – Gal Gadot as Diana Prince/Wonder Woman in the DC Extended Universe
Patty Jenkins has confirmed that Wonder Woman 2 will be another period piece, this time set in the 1980s. Although most of the DCEU has been set in a chronological order, Wonder Woman has been the rare exception. Though Wonder Woman first appeared in the film franchise during Batman V Superman, the majority of her debut movie was set during World War I, the earliest that any superhero movie story has been set.
There was heavy speculation that Wonder Woman 2 would follow suit, given the ending of Diana’s debut. Wonder Woman has a rather bittersweet ending with Diana mourning the death of Steve Trevor but still resolving to help humanity and be a part of the world. This was at odds with Diana’s story in both BvS and Justice League, where she was re-entering the world after a long absence. It appears that among many other things, Wonder Woman 2 will answer the lingering mystery of Diana’s disappearance.