Chinese site WPDang claims that Redmond will be showing off two new Lumia handsets, the Surface Pro 4, and a Microsoft Band 2.
WPDang claims there may be a slimmer Xbox One as well, but it seems a bit weird that this rumour has only been heard in China.
Microsoft could launch more Surface hardware to go alongside the Surface Pro 4. There had been rumours of a Surface Mini alongside the Surface Pro 3 last year, but the device was scrapped just weeks before the launch. Eventually we got the not-bad-at-all Surface 3 with a 10" screen. We've had hints about additional Surface hardware, but Microsoft has kept the lid on this rather too well.
Microsoft will be launching two new Lumia handsets and the Surface Pro 4 at the event. A Lumia 950 and Lumia 950 XL have been expected for months, and specifications for both handsets have already leaked. All that's really left is to see what these handsets look like and how they fit into Windows 10.
As Apple has discovered, there is only so much you can do with a tablet and so Microsoft's Surface Pro 4 won't be a drastic change from the Pro 3.
Microsoft is expected to increase display size and resolution, make the Surface Pro 4 thinner and lighter, provide Windows Hello support, possibly a fingerprint scanner and a better keyboard.
It is possible that the company will fit an Intel RealSense camera into the thin device, but it might be a little too bulky.
Microsoft will also unveil the Band 2 at its October event. Little is known about the device but it is expected that these will look a bit better than the early Band 1.