More on topic, I got to try out an SP3 at Best Buy on Saturday. I found that the pen was actually worse in accuracy than the Wacom on the SP2, mostly around the edges. Mind you, I wasn't able to calibrate it due to lack of admin privileges. I also didn't like the lack of a designated spot to put the pen. You can definitely clip it onto the edge of the keyboard but it will be sticking out and you'd need to take it off to use the keyboard every time. Not sure if I like how the new keyboard bends and magnetically sticks to the tablet to give it a slant: to me, that's unnecessary and doesn't really make it all that much better as a keyboard.
All in all, I think that the SP3 is actually a downgrade from the SP2 in all categories except for weight which is a marked improvement and arguably screen size depending on if you really need more vertical space. Although it's admirable that they tried to reduce the weight and make it thinner, it looks like you can only do so much with the current Haswell CPU chips such that the thermals are now impeding the performance.
Can't wait until SP4 with, presumably, the Broadwell CPUs which should fix the SP3's thermal problems.