Cinema5D interviewed Sigma CEO Yamaki San. Some info:
– The camera is already in production
– The firmware is now close to the BETA version
– Sigma hopes to ship the camera in autumn
– Sigma hopes third party manufacturers will make a headphone accessory for the FP
– Sigma FP will not have flat profiles at start. But they may add it with a future firmware update
– There is no plan to make L-mount pancake lenses yet.
via L-rumors.com