Microsoft is currently presenting the event for Windows 10 and is expected to announce news products hardware but also to pre-present the next one version of Windows 10 (codenamed Redstone 2, which is scheduled for release next spring).
Rumors also suggest that Microsoft will announce a new Surface-branded All-in-One PC (perhaps even a few models). Some new accessories are also expected to be introduced such as the Surface Dial, a standalone device to help users use a digital pen. We are also waiting to see the new Surface.
On the software side, Microsoft is expected to announce new edition of Paint which will probably just be called Paint 3D.
Paint 3D will be a UWP app that will contain all of the classic version tools, but it is expected to work with 3D objects as well, as we are close to Windows Holographic, which we may see as well.
Watch the live event from the following stream