At the moment Google is working on adding pressure sensitive touchscreen support in Android N. Google says that the manufacturers who build Android devices wanted this use case addressed by the OS itself — probably so they wouldn’t have to develop their own methods individually. This means that we’ll as see more devices like Huawei’s Mate S with pressure-sensitive screens, they’ll be more likely to get 3rd-party developer support because they can code for all Android devices instead of reinventing the pressure-sensitive wheel for each OEM.
The whole point of releasing these Android N previews so early. According to Google, is to get developer feedback and get manufacturers on board to improve the update cycle for newer versions of Android. Building support for something like pressure sensitive screens directly into the OS means that those manufacturers will be more likely to support the new OS instead of hanging on to code they build for older systems.