New 3D renderings of the CagePro were added today showing that the final design will now accept threaded filters for use with CPL or ND. The top handle of the CagePro has also been modified with additional accessory mounting points.
If you're not familiar with the CagePro, it's a new GoPro Hero3 Accessory Cage that houses a Canon LP-E6 battery used to power up your GoPro Hero3 for over 5 hours of continuous run time. It started out as merely a concept with working prototypes but was quickly 'Bumped' right into production on it's first day.
You get more information and can follow the product development over at https://PhotographyandCinema.com/pages/cagepro