I don't know. I feel Warfronts are something easier to create than dungeons and raids, and some kind of group repeatable content should come with 8.2.5.
Also, they said we would still get new warfronts (plural), so assuming that was not a misleading statement nor they changed plans, I guess there will be one in 8.2.5 and another in 8.3.0.
Edit: Found the source: "There will be additional warfronts in Battle for Azeroth, and the rewards to the existing one will likely be tuned and changed."