If the insider information is to be believed, we should expect the Samsung Galaxy Note III to be available for purchase in September. The company's third-gen phablet is expected to start shipping in Week 36, which goes from September 2 to September 8. Actual market availability usually takes about a week after the units start leaving the factories, so mid-September seems like a a likely target.
As for the Samsung Galaxy Gear smartwatch, it's going to hit store shelves in October or Week 40 to be specific (September 30 - October 6).
Furthermore, Samsung is believed to have dropped using 16GB of inbuilt storage for its high-end devices, meaning that the lowest memory that'll ship in the Galaxy note III is going to be 32GB. We'll find out more on September 4 at Samsung's Unpacked 2 event.