

UBM TechInisghts recently performed a teardown of the iPhone 4 and discovered that Apple may have originally planned on including a gyroscope in the iPad first. After examining the iPhone 4 motherboard, they found that the iPad also had an empty slot that accommodate a gyroscope chip (see above).
For whatever reason, Apple must have abandoned the plans in the final shipping version of the iPad, though it's reasonable to believe that a gyroscope could make it into the next revision....UBM TechInsights, has found that the iPhone's 3-axis digital gyroscope is likely slated for the next generation iPad as well. TechInsights senior analyst Steve Bitton said there's an almost-perfect spot (4mm x 4mm); the exact size of the MEMS gyro) for it, located right beside the iPad's accelerometer.
This differences between gyroscopes and accelerometers is detailed in this (rather dry) video:
http://www.youtube.com/watch?v=s19W-MG-whE
Article Link: Gyroscope Likely to Come in Future iPad