Sorry for that many posts, but I just got another idea regarding the icons.
The third row of icons and the last two icons in the fourth row show something what is called 'teardrop design' which plays nicely with the water theme of Jolla/Sailfish. I think that it would not make much sense to just make this theme and not expand it beyond the menu icons.

My guess is we might see this theme in hardware design of the Jolla phone - probably not as radically as in the aforementioned Nokia phones, as it would steal screen space, but at least symbolically.

What do you guys think?