Raytrix published its presentation at Nvidia GPU Technology Conference held in May 2012 in San Jose, CA. The 38min-long video explains the technology behind its light field camera:
The video is mostly based on the company's technology presentation from 2011. By that time the lightfield cameras competitive landscape looked like that (note, Lytro was not in production yet):
The latest Raytrix R11 camera has an array of about 20,000 microlenses, produces 2.7MP images out of 11MP sensor and uses a fast Nvidia GeForce GTX 580 card to deliver 30fps video. The camera costs 20,000 euros.
A nice overview of light field cameras was published by IEEE Spectrum in May 2012.