Oppo's website has added a new countdown timer. While the site says "Possibilities unfold on September 23rd," the countdown timer will hit zero on September 1st. So that leads us to expect the Oppo N1 to be unveiled on September 1st with the actual launch taking place on September 23rd.
The Oppo N1 will compete with other camera-centric models like the Samsung Galaxy S4 Zoom, the Nokia Lumia 1020 and the yet to be announced Sony Xperia Z1.
source: Oppo via gizChina