Rebirth absolutely. New 52 I’m not as interested in since it’s a bit more generic and was already sorta adapted with the DCEU (albeit combined with elements of TDKR’s design). I also think it would be really cool to get a gray and blue batsuit. That or the purple on the inside would be really nice, as it’s rare to have a splash of color on Batman’s suit like that in films.

Yes

Give me the Arkham City suit with the gold outline around the logo like Rebirth.

If Superman is anything to by, it'll be the New 52 suit with pre-Troika blue cape, cowl, boots, gloves, and trunks, and the Dark Knight Returns chest emblem.

I hope they don't over-complicate it that much, though. Something in a shade of grey lighter than practically black would be nice.

If it can work in live-action, yes.

Absolutely.

Yes

Batman should wear trunks in the DCU.