Keep up the good fight!
Do some people not realize that kevlar, the primary form of body armour in the world right now, is a synthetic fiber/fabric? The heavy rubbery/metallic armour of the TDK trilogy, recent games, and now the comics is pure fiction. Granted, it has to be pretty thick and bulky to be effective and military grade armour typically now has ceramic inserts as well for added protection. However, those vests are intended to protect against military grade armour-piercing rounds and explosives. Weaponry that should be pretty uncommon in Batman's line of work.
Moreover, as mentioned, the next big thing in body armour is the use of nanotechnology to create nanofiber armour that is the weight and flexiblity of normal cloth. Given what we all know about Batman and Wayne Enterprises, it would make perfect sense for Batman to be equipped with body armour that is 10 years into the future in terms of being feasible for wide scale production. Sure, some parts of the suit should probably be reinforced with other materials. I believe that, like Kevlar, the nanofibers under development will be of little usefulness against edged weapons. Overall, there is no reason for the Batsuit not to be lighter and more "fabricky" in construction this time around.
As well, given what we know about Snyder and his commitment to having his stars physically become their characters, the next Batsuit need not be big and bulky for audiences to take Batman serious.
Finally, for story purposes, it makes sense for the regular Batsuit to be rather understated. If they do go for The Dark Knight Returns angle and have Superman and Batman come to blows, it would far more dramatic for Batman to break out some form of power armour or special suit for that conflict when it comes like he did in that graphic novel. It's rather unsuspenseful and anti-climactic if Batman is constantly walking around in his anti-Superman suit.
