Being a next-gen game, the city depicted is very much alive, with various details; it reminds me of another new game, Gravity Rush 2, plus on the other hand, the upcoming plan to roll out Sony's VR technology, perhaps for enthralling games like these, allowing for the ultimate in game immersion. After all, the original Infamous games had Move peripheral support.
The "famous" or "infamous" paths you can follow, are really a basic addition, like in previous entries, they just offer yet another simplified aspect; though it must be said, unless you count the clever twist at the ending of Infamous 2, these don't serve much purpose, as large part of the game is a constant fight against the policemen du-jour, the Department of Unified Protection, who are also conduits, and it provides insight about our life itself, in that why wouldn't everyone work together, if they are so similar. I get the impression the engine would have run well on the previous Gen, though there are certain details, namely the powers and weather effects, that look particularly stupendous.
As far as the main character, he seems influenced in style and clothing, by Seattle's own music scene, Grunge music, which was quite popular in the nineties; it is also the land of Starbucks, and coffee shops do indeed appear in the game plus a "hooverville" can be found. As mentioned above, the character is younger, and more of a thrill seeker, discovering his powers grants him a new life; he is feared by the populace, but also stronger indeed. Gameplay revolves around recharging our heroes' abilities with smoke; that is cars on fire or chimneys, neon signs, just to name a few, whereas in previous games, it was about electricity. The gameplay remains similar, though now the powers seem more flashy, in hindsight.