Differences between 1st and 2nd edition?

Only info I could find is that the chipset has been improved.

What else is different?

Reviews of the 1st edition critize most strongly the inferior picture (and video) Quality.
Seem the 2nd edition can now record 1080 (not only 720p), but what about the general image quality? Has it improved, too?

Camera hardware (and software) is the same so picture quality isn’t any different.