The Genuino 101 board have the same size of Arduino UNO, and fit the case for UNO, except the MASTER RESET button cannot be accessed if the top cover closed.
Fritzing part of Arduino/Genuino 101 can be download HERE.
More: - Install Arduino/Genuino 101 to Arduino Software and run Blink on Genuino 101 - Arduino/Genuino 101 example to read button and turn ON/OFF LED - Test the Gyro of Arduino/Genuino 101 - Arduino/Genuino 101 CurieIMU Orientation Visualiser