What we've learned about the Surface Pro 3 is that it will have a larger screen, possibly as large as 12 inches, up from 10.6 inches on the Microsoft Surface Pro 2. It is also supposed to be thinner than the previous Surface Pro 2 model.
We also want to take this time to tell you what we currently expect to see from the Microsoft Surface mini. We expect a 7.5 inch screen with a 1080 x 1440 resolution, and a 4:3 aspect ratio (as opposed to the 16:9 aspect ratio seen on the Microsoft Surface RT and Microsoft Surface Pro). It will feature Active Pen support, which is expected considering that earlier rumors have pointed out that the Surface mini is a tablet made for messaging. The accessory cover will double as a kickstand since there won't be one on the device. And the slate will be available in silver.
The event is coming tomorrow, so stay tuned!
source: WinSuperSite via MicrosoftNews, WMPoweruser