ARRI just released version 3.1 of its ALEXA firmware.

Key features are:

• Full support for both the ALEXA and ALEXA Plus cameras.
• Integrated functionality with the ARRI Wireless Remote System (WRS) lens controller. This includes both generations of the ARRI transceiver module, known as the Yellow Radio and the White Radio.
• Communication with the new ARRI Remote Control Unit (RCU-4)
• Lens Data System (LDS) display on the ALEXA Plus. A later SUP will also capture this information in metadata.
• Dual SxS card recording. Both card slots can be set to capture identical files simultaneously, making backup file transfers faster.
• ARRIRAW frame grabs. In addition to the other formats already available, frame grabs can be captured in ARRIRAW.