A teardown of the iPhone 4 revealed Apple may have had plans to include the gyroscope in the iPad as well. UBM TechInsights discovered that. The motherboard of the iPhone 4 showed similarities with the motherboard of the iPad. The picture below shows an empty slot, exactly the size of the gyroscope chip installed in the iPhone 4.

…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.
The weird thing is, there is no gyroscope in the iPad as far as we know. I think it’s fair to assume Apple will include a gyroscope in the next generation of the iPad. This could be added to the list of things the next iPad will probably include. So far I think we can say that the next iPad will have a camera, gyroscope and a Retina Display.
The video below shows the differences between gyroscopes and accelerometers: