The fictionopolis is one of our favorite concepts here, and a powerful element in our Dynastic Centerpiece Model. It was once a standard in DC comics, faded under the pernicious influence of Marvel-style "realism" *snort*, and has reasserted itself strongly in recent years.
Its chief modern apostle is James Robinson, of Starman fame. There's a lot about Robinson's Starman I didn't like (weak plots, mostly), but his achievement over seven years (1994-2001) in creating an entire fictionopolis (Opal City) and making it unique impressed and delighted me to no end. His success led the charge back toward the fictionopolis as the setting of choice for the modern DC hero: really, if you don't have a fictionopolis of your own, you're just not top drawer. Oh, and for Wonder Woman's purposes, Washington D.C. counts as a fictionopolis; honestly, I think it counts as one for me.
I credit Robinson's work on Opal City with inspiring the "new Gotham City", suddenly an island and now with a map all its own, as debuted in No Man's Land (1999), and the B13 revamping (2000) of Metropolis (also with a new look and layout of its own).
The B13 changes were de-vamped, of course, but the desire to give Metropolis its own character as the home of the Man of Tomorrow didn't go away. Kurt Busiek's certainly been striving toward it, and under his pen Metropolis has become the place where you might encounter, on any given day, Kryptococcus the Omni-Germ on the Avenue of Tomorrow.
The new creative team is building (quite literary) on Busiek's beginning vision of the city. Yeah, sure, it's "Deco", but most of DCU cities are, to some degree. That's a natural function of DC's roots in the late 1930s. But, within the Deco vernacular, Metropolis is clearly being defined as having its own characteristic style; vertical, bright but not shiny, glass as an accent but white stone for structure, soft rather than hard, powerful but not harsh.
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Put it all together and you get