Re: Star Wars Episode VII
The equipment doesn't look fundamentally different at all.
Tank in 1944:
Tank in 2012, almost 70 years later:
Naval ship in 1940:
Naval ship in 2012, again, 70 years later:
As for fighter jets, hell, we're STILL using the same basic designs as we were in the 1970s. 40 years, look the same.
That's what I mean about an evolution in design, rather than radical shifts.
Compare the F-4:
...to the F/A-18, pictured alongside the F-22.
Similarities? Sure. But not identical. I mean, yeah, you can find identical designs in some cases, but there's also evolution in there, primarily as functionality changes.
That's why, within the EU, the evolution of design in the X-wing to E-wing made sense. You can see the provenance of the E-wing, but it's not the exact same thing.
I could see them doing something similar in future films. That said, I could also see them doing something radically different.
Take, for example, the Sukhoi Su-47 Berkut:
Pretty radical departure from the F-4 look, even if it shares some similar design characteristics (granted, it's also not an American fighter, but still).
As for tank design, we actually have changed design philosophies on armor several times in this country. So, yeah, you can show me a Centurion from '44, but I can just as easily show you a Sherman tank, or an M-60 Patton, and while there'll be some design similarities, it'll look pretty different from the Sherman, from the Centurion, and from the M1A1 Abrams.