The Spec sheet tells a pretty sad story. It is a sleeved Z1000 motor (as heavy as a 919) with a steel frame and budget suspension. So ... basically a 919 in different clothes. Yamaha tried the same thing with the FZ8, and it was just as heavy as the FZ1, just with weaker motor and suspension. It does look a treat though.
IMO if you want a naked hooligan bike, the Triumph Street Triple R is the way to go. I have a friend who picked up a 2014 leftover for $8K OTD. ABS, Brembo radial brakes, fully adjustable suspension, and a motor that WAILS. The 675 won't have the grunt of your old 919, but let it spin up and it'll keep you smiling.