Other notes:
Upon initial configuration, this took about maybe 20 minutes - I didn't exactly stopwatch the time or remember, but it wasn't long. My settings all came through, due to using the Microsoft account on my Surface Pro 2 of the past in Windows 8 (of which only the synced settings appeared).
Upon installing my software loadout, the tiles are recognized in place where I had them before on my Surface Pro 2. I cannot think if any desktop icon layout would allow such a thing. Again, I synced my Start screen layout, so that plays into some of the setting transfer.
Palm blocking works. If I form a typical handwriting "fist" the Windows haptic button does not register, even if I do not have the pen in hand, ready to draw or take notes. Even gripping the side with my thumb a tad second ready to rest, it would not register. If I "fat thumb" on the grip area, the Windows bezel icon would not activate. If I give a distinct press, thumb or finger, it would then switch to the Start Screen.
A nifty thing I noticed, in some lighting when looking very up close at an angle, one can definitely see "tron" lines on the screen versus the Surface Pro 2. Possibly one is seeing the N-Trig implementations and the proximity of the layer for digitizing close to the screen.
The trackpad on the keyboard cover, takes lessons learned from both the Pro 1 and Pro 2. It is recalling the past, more tactile buttons of the Pro 1, while being more or as sensitive as the Pro 2 for me. Being a larger device, the trackpad is obviously more roomy, wider and taller. HOWEVER, the trackpad for me is a contingency device (given touch screen and pen access) - of which can now be turned off in the Modern PC Settings areas.
Scaling defaults to the middle ground, in Modern areas, can be adjusted to either be smaller or larger. Desktop scaling, it starts off at 150% much like the past Pros I worked with. I feel no need to change it down to 125% just yet though, as for both touch manipulation and pen manipulation while maintaining UI view is fine.
In setting up some programs, there ARE areas of window text dialog where that area of UI hasn't adjusted - namely in the installers. But that doesn't hinder the end result of working with an application (for my applications at 150% scaling). The font is blurred in the installer text dialog with some installers.
One thing of note, is that some UI is definitely fixed. the Autodesk exchange, search, and help top bar does overlap with the minimize, maximize and close buttons. But this is in a previous software version (2012).
I do wish another pen is released, give it barrel and tilt recognition in that pen with a pressure erase end. Microsoft said it would have software driver configuration options more robust to allow a setting of pressure curves that would apply to all programs, and those programs can finess them if needed. A radial menu with shortcuts and functions like Wacom would also be good.