While there were rumors that pointed to how the Moto G2 will roll out this September 10th, then it would not be too far off the mark to have the smartphone itself announced just a week earlier. The teaser site does point to the possibility of four more devices revealed by Motorola this September 4th, and an intelligent guess would lump the likes of the next generation Moto X, the Moto 360 smartwatch, the Moto G2, and what looks like a Bluetooth headset.
Do take into consideration that an announcement date as well as a release date are two very different entities, although one can breath easier with an announcement knowing that the product has been confirmed on an official basis.