Yes, as
2seven0 said. They are also extending Peters Canyon trail from Warner up to a trail just S of the train tracks. You will still have to deviate out to Harvard to cross the tracks, but that's it. Supposed to be open soon from what I see on OC Wheelman facebook posts.
On weekend mornings there are LOTS of riders, pedestrians, joggers, kids, dogs, strollers etc. on the SD Creek trail in Irvine. So be prepared for this.