The Official Site posted an interview with set decorator Peter Walpole. Besides showing photos from many of the sets, some of the locations were described. Here's a highlight:

One new environment is a somewhat seedy nightclub found in the depths of Coruscant. A locale with a character all its own, the nightclub is a place where transients and slumming elite can intermingle, carouse, drink and -- as will be seen in the finished film -- gamble.

"There's going to be gaming going on in the background, whether it be a roulette table or some sort of gaming machine," says Walpole. "We took some aircraft parts, put some screens in them, and tidied them up. We found a couple of old wrecked arcade games that were just a shell. We took those, turned them upside down, and they took on a completely different appearance. The bar itself has evolved. We used the famous plastic beakers and whatnot, and got different shaped aluminum tubes for drink dispensers. George came along at the end and liked everything, but wanted us to just change the center bar slightly. What he wanted was acrylic tubes with liquid in it, so it almost had a church organ effect. That worked really well. I wish I'd thought of it first, but hey, that's probably why he's directing."

Another less-than-polished environment is the hold of an interstellar freighter, glimpsed briefly in the "Forbidden Love" trailer. The gloomy interior was another great opportunity for Walpole to infuse personality into a set. "You would have refugees on the floor, but at the same time, there'd be cargo strapped down by some sort of netting. People take a lot of things with them, so we're making bags and stuff to carry and bits and pieces of personal belongings. There was kind of an eating area that worked really well, because we put some really weird things in there. A hand-operated plastic tumble dry washing machine type thing -- they were turned around, painted and stuck to a wall."

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