I dont mind that it only comes with Windows 8.1 and not Pro -- as it comes with a free upgrade to Windows 10 the following month (Windows 10 is expected June, 2015).
I pre-ordered the Surface 3 yesterday, with the cover. I didn't pre-order the pen just yet. This will be my first Surface tablet. I've had an iPad Air, and a Asus Transformer. Looking forward on trying out the Windows tablet. :)