The PX4Flow smart camera board will be released in a few weeks (designed by ETH, manufactured by 3D Robotics). There will be a ROS library to drive it, along with the PX4 libraries, Lionel Heng from the ETH Computer Vision and Geometry site announced on the ROS news site:
I would like to submit a new repository for indexing: https://github.com/cvg/px-ros-pkg
This repository currently contains a ROS package for interfacing to the soon-to-be-released PX4Flow optical flow board (coming soon from 3D Robotics). We have plans to add a ROS interface to the PX4FMU autopilot, and software for MAV autonomy as showcased in our recent IROS paper (http://www.cvg.ethz.ch/MAV ) in the coming weeks ahead.
Best Regards, Lionel Heng