I think the biggest risk we are facing right now is figuring out the best way to integrate the force sensitive resistor (FSR) inside of the pen to allow for easier surface touch and liftoff detection. These risks are being managed by constantly integrating and revisiting the housing design to ensure we get the design for the FSR correct. The contingency plans we have so far is just use a button or two since these are easy to integrate or use the optical flow sensor and IMU together to figure out liftoff detection.
No new changes made to the design and our schedule remains the same.