I don't think the Enterprise needs any real redesign. More details? Sure. After all, this time it's on the big screen. But no matter what they do to it, it's still gonna be a big flying saucer with nacelles and there is a limit to how kwel it can be.
There is nothing wrong with retro designs. The PT used retro designs pretty much exclusively and does anyone whine about that? I sure don't hear it.
So there is no 'need' to heavily alter the look of the Enterprise. If Abrams does so it is his choice
, not something he was forced to do.
The '60's Batman was essentially a parody, so that's not really the best example.