The current version of Pixelblaze sensor board has an accelerometer for fun effects, but two forum threads have asked about a gyroscope.
Benefit: Still fuzzy so far. Both of those threads were exploratory, neither of them (yet) describe a concrete example where gyroscope is critical.
Cost: Adding a gyroscope (or replacing existing 3-DOF sensor with 6- or 9-DOF sensor) would require change to the sensor board BOM, PCB layout, STM32 firmware, and Pixelblaze to expose a new API.
Unknown (to me): Is there a way to patch gyroscope data into a current revision Pixelblaze for exploration and prototyping of patterns?