Evidence Points to Perceptive Pixel Active Pen for Surface Pro?

I've seen it speculated before that the pen for the Surface Pro is Perceptive Pixel, and I personally was even a slight bit of a doubter, saying that we don't know that for sure. I'm not sure about others, but I have been very curious about this ever since the original reveal. Now, previous to this, I was leaning towards it being a Perceptive Pixel one over Wacom by about 60 to 40%, but I noticed on the <a href="http://blogs.msdn.com/b/vcblog/archive/2012/10/04/10348486.aspx">Project Austin blog</a> tonight that "The devices and drivers we have been using on Windows 8 sample 120 input points per second."<p><p>One would also assume that people working inside Microsoft on a project like this are testing on Surface Pro (prototype?) hardware. However, the sampling rate for Wacom hardware is 133Hz. So, clearly, whatever hardware they are using is not using Wacom hardware.<p><p>N-trig hardware, on the other hand, is ruled out because in the Surface Pro reveal, they showed being able to flip the pen over and erase lines. That is just not possible on N-trig hardware, which instead uses an eraser button on the side of the pen.<p><p>Apparently (this is new to me), Atmel has an active digitizer solution, which HP is using in their Elitebook 900. Information on their solution just says <a href="http://www.atmel.com/products/touchsolutions/touchscreens/default.aspx">"up to 140Hz."</a><p><p>However, if you go to the Perceptive Pixel site, they specifically mention a <a href="http://www.perceptivepixel.com/products/55-lcd-multi-touch-display">"120 Hz frame rate for display and touch sensor."</a><p><p>With that being the case, I'd say it's more like 90% certain now that the Surface Pro will use a Perceptive Pixel -based digitizer solution.