I found this from denofgeek. It explains the changes in the Batsuit. It's definitely a step backward that they want to emulate the Nolan suit. Basically, Ironhead Studios Jose Fernandez got pissed and apparently they can't use the formula for his cowl, which is why he's back to wearing Urethane and can't turn his neck again...also why he's going to make a "tactical suit" of uncovered plating. Sound familiar?
"Indeed, something of a rarity in superhero cinema, an entire workspace and garage on the Leavesden Studios lot outside of London has been appropriated as the one-stop shop for the most discerning of superheroes’ accoutering needs.
'We feel this is quite a unique scenario,' Wilkinson says through a microphone while wearing his own dapper pairing of red and gray. 'I don’t think any other major superhero films have done this before. Usually, you get your different vendors and you send one costume here and one costume there, you check in on them, and they come back, and you shoot them. Here, we had this amazing situation where we can create all of our costumes in-house.'
Presumably, Ben Affleck’s costume transitions are a little more elaborate given the ever adding layers to the uniform. Despite being mostly the same shape, if a bit thinner than his costume in Batman v Superman: Dawn of Justice, the suit has undergone some subtle changes. The first major one to be noted by the naked eye is that it's a darker gray than what appeared in his previous film. Still more amusing is the cowl, which now enjoys a far more expressive and aggressive scowl. It should make Batman fiercer with a carved-in rage similar to Christian Bale’s later masks, but given the gray affectation and shorter ears of this universe’s Dark Knight, it reminded me of the eyebrows on the Adam West Batman suit. But you know, angrier.
The costume also has new armor plating derived from a carbon fiber weave that is discreetly hidden under the familiar mesh from the last movie.
However, what was more of a work in progress is the Batsuit that Affleck will don in the film’s third act. Still in the molding stage and painted black (it will be gray in the final film), the costume is described by the filmmakers as the “Tactical Batsuit.” It will be designed by Bruce and Alfred after they decide he needs more protection when going up against New Gods, which is apparent in its heavy strapping and unhidden carbon fiber plating and proud uses of leather. It also will come with, according to concept art, a carbon fiber cape and goggles for the eyes.
To Wilkinson, it is another fun reminder of the whitened eyes Batman has in the comics, with the idea of the goggles playing off the light during the climax of Justice League."