あれ？GoPro４ではなくてGoPro3Plus?
A7チップだとすると4K 30fpsは無さそうですね。。
さて実際はどれが正解なのか？それとも両方出る？？
明日朝くらいまでに公式発表あるかもしれませんね。（間違ってたらスミマセンｗ）

20% smaller and lighter housing (waterproof to 131’/40m)
SuperView video mode captures the world’s most immersive wide angle perspective
Auto Low Light intelligently adjusts frame rate for stunning low light performance
33% improved image sharpness and reduced distortion
Faster built-in Wi-Fi for enhanced connectivity to the Wi-Fi Remote (included) and GoPro App
25% longer battery life
Upgraded audio performance