Look what we found!! Microsoft seems has registered two new trademarks: Inkback & Touchback. These two are word marks and will look like shown in the below image.
The description provided for classification of these two word marks defines them as related to computer software that “facilitates bi-directional user input between devices”.
In International Class 009 (US 021 023 026 036 038):
Computer software that facilitates bi-directional user input between devices
So, may be with Windows 10, Microsoft has more aces up its sleeves than we already know.