The baby is the Hero7 White equipped with 10Mp camera capable of 1080p. The camera has a built in battery as has the Hero7 Silver. The White has standard stabilisation again, as does the Silver. The White will retail for $299.
Then up the spectrum is the Silver. The difference from the White is that the Silver will shoot 10mp 4k30 as well as 1080p. The Silver also has the added GPS and Time Lapse Video feature as has the Hero 7 Black. Retailing at $449 the Silver is likely to sell well.
Top of the pile is the Hero 7 Black. This is a 12mp camera capable of 4k60 video. Comes with a 1220mAh rechargeable battery and has what GoPro has called, "Hypersmooth" stabiliser. The black has all of the other goodies including 8x Slo-mo (where as the White and Silver is 2x Slo-mo) and time lapse / gps and voice control. The Black will also allow you to live stream. Retail $599