http://www.notebookcheck.net/Lenovo-Classic-ThinkPad-models-with-Kaby-Lake-announced-T470-T570-T470s-T470p-L470-L570.189047.0.html
Looks like Lenovo did a bare minimum update to the p.
The touchpad/trackpad change appears to be software rather than hardware, co-developed by Synaptics: http://arstechnica.com/gadgets/2016/10/pc-oems-ditch-the-custom-touchpad-drivers-give-us-precision-touchpad/
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