N-Trig engineers enlisted my aid in better understanding the issues confronting them. Within 24 hours of our initial contact, I was given exclusive access to a new driver test build.
[...]
Indeed, isolated issues remain to be sorted out, but I can now report that the vast majority of Wintab software that I've tested now recognizes pen pressure on the Surface Pro 3. Additionally, I tested the new drivers on the Sony Flip 15A and Acer Aspire R7-572 and both have yielded similarly positive results.
[...]
ZBrush? Check. Painter? Krita? Check. Check. Mischief? SAI? MyPaint? Check. Check. Check.
Notable exceptions include the ever problematic Autodesk Mudbox, which still doesn't recognize the pen and Adobe Illustrator, CorelDraw and CorelPhoto-Paint which all exhibit intermittent pen issues.
The N-Trig developers tell me that they're noticing other more subtle issues in some software which they're attempting to address before the Surface Pro 3 is released June 20.