Kind of. Mark Jackson let them play up-tempo-ish, but Kerr is really pushing them to look for early offense and force the break whenever possible. When the early offense isn't there, they go into more of a motion offense whereas Jackson was very Iso-heavy. The Warriors really aren't a strong iso team though so they had an average offense despite a lot of weapons. Kerr is getting a lot more out of Bogut and Barnes. Curry, Klay, Barnes, and Draymond all got better and we have a good backup PG in Livingston which we've lacked sine Jarret Jack left. Speights looks excellent after a horrific showing last year. The roster is better, but Kerr also puts these guys in better positions.
Defensively, they were already really good but have gotten better due to a few factors. First of all, they switch on EVERYTHING and it blows up the opposition's pick and roll game. Klay, Iguodala, Livingston, Draymond, Barnes are all 6'7-6'8 with 6'11+ wingspans. They switch everything because they can all guard 3 or 4 positions and they just cover a lot of space with their mobility and length. Harrison Fucking Barnes is probably the worst defender of the bunch and hes still pretty solid. Curry looks decent on defense this year and they're letting him guard point guards which keeps everyone else in their natural defensive matchups. Draymond is one of the best defensive PFs in the league, so he's a clear upgrade over DLee in that regard.
It all falls apart if Bogut or Curry are out for any significant amount of time. They also turn the ball over way too much and could probably use another athletic, defensive big man. Their back court and wing rotation is absolutely nutty though and Kerr already said he isn't going to bench Draymond when Lee gets back. Their bench is Livingston, Barbosa, Iguodala, Lee, Speights, Ezeli. That unit alone could make the playoffs in the east.