After registering as a developer, one can download the CA-SDK v5.1 (ca. 62 MB) that covers the MPU-9250 on page
http://www.invensense.com/developers/software-downloads/
Direct download link (might need free registration as a developer):
http://www.invensense.com/developers/software-downloads/#sla_content_209
CA-SDK v5.1
The CA-SDK is our latest SDK which features the MPU-9250 and supports 9-axis operation. The TI MSP430 MCU is pre flashed before shipping with our Embedded Software library which allows for 9-axis operation. This library is also included as an option in the eMD 6.1 package. The board is also populated with a Bluetooth module and a temperature, humidity, pressure, proximity, UV and Ambient light sensors for development of contextually aware applications.
This wearable sensor form factor board can be purchased in our InvenSense Online Store. A robust Android and Python demo are included for visualizing and logging data.