Some additional coverage on the Sony a9 mirrorless camera ($4,498):
Sony a9 eye-tracking AF demo:
Another Sony a9 focus tracking demo:
Sony a9 - the best wedding camera:
Sony a9 menu system:
Sony a9 photographing the Kentucky Derby at 20fps:
Interview with Sony about the a9:
Sony A9 vs Sony A7S II:
https://www.youtube.com/watch?v=lO_gYzFQJYg
Sony a9 Q&A:
Via SonyAddict, picture credit: B&H