Aiden in the Announcement Demo. How does he get to his target? He causes a multi-car pileup, and rescues a civilian trapped in the aftermath before tearing through the target's goons and eliminating him.
Aiden in the trailers. He stylishly kneecaps the leaders of a sex slave ring and after escaping into an alley, is cornered by the police but causes a city wide blackout allowing him to escape.
The gameplay demo's suggest you will have opportunities to do this by using the city as your weapon. From causing fuse boxes to explode to making gas mains errupt.
After saving an ally from a mysterious group of killers who are hunting him for a motherboard he stole, Aiden is cornered by the police. He causes a citywide blackout, kneecaps the officers in slow motion, boards a speedboat and is long gone as the power comes back on.