Here’s Kaplan discussing how he immersed himself in the Star Wars aesthetic the new stormtroopers:
…I went up to George Lucas’s archives—huge building—and just spent a day going through sketches and looking just to get the tone of the movie, you know, in my guts and veins so that when I went to London I felt equipped and inspired, which I certainly did.
But the old stormtroopers uniforms would not be usable. Audiences of today have become so sophisticated that a lot of things you could get away with in the past, you can’t anymore. So the new uniforms are much heavier. Also, the action in the film required them to not be “VacuFormed” [like the old uniforms] as those all broke and cracked. These new ones are much more heavy-duty, but they are redesigned, too, they’re not the same stormtroopers.
In other words, we’ll see much more intense action from stormtroopers in the new film.
Meanwhile, here’s Williams when asked about including motifs from the original trilogy for Luke, Leia and Han:
There are some scenes where we do make reference to earlier thematic pieces. We haven’t done it yet, but we’re planning to do it. It’s something that I think will seem very natural and right in the moments for which we’ve chosen to do these kinds of quotes. There aren’t many of them, but there are a few that I think are important and will seem very much a part of the fabric of the piece in a positive and constructive way.
Both are great interviews, and include mentions of Blade Runner, Superman and Raiders of the Lost Ark.