It is believed Microsoft will use a variant of Intel Haswell processors used in Surface 2 Pro for the third installment of the Pro, running Windows 8.1. The hugely popular Pro 2 has a 1.6" Full HD screen and Intel Core i5 4th gen processor, inside.
A recently published Microsoft support document made a reference to Surface Pro 3, although Redmond giant has since corrected the "typo."
Samsung are also said to be launching a 13" tablet, soon.
"Join us for a small gathering," the Microsoft media invite declared, suggesting something small is to be unveiled on the 20th.
"Surface mini will be based on an ARM chipset and will run Windows RT 8.1" a Windows IT blog suggests and a "high quality stylus for note-taking and OneNote integration."