Freefly is known for making High Speed E-mount cameras (you can find them here at BHphoto). But this is past: Today they announced the new Ember 2.5k camera with active Canon EF mount and 2900fps.
Interesting information can be heard in the video above starting at minute 1:31. Sony has asked Firefly to stop using its E-mount. This is not news I like, because I would like third-party manufacturers to produce E-mount cameras. What do you think about this?