To answer about the flat design. It's not a fashion for nothing.
The fashion started in the webdesign, for a very simple reasons : Faster design work, lighter website, faster display of pages = More $
After that, in the software industry, they were curious, so they made very serious researchs on consumers (done by Microsoft initially. Someone asked "who's the first ?") and then followed by others (like Apple for exemple, with IO7). By the way, the democratization of smartphones and tablets helped the flat fashion. (or vice versa [big grin])
If the flatdesign is interesting is that it makes interfaces more clear and clean. This increases readability (so it's easier to put the content in the front).
You cant content everyone. This is what mostly people like now, so they will probably choose that. Im sure they have a few UI designers in he team, and its very possible they like this clean style that is used a lot now.
Or maybe dont, and we get something different.
But the sure thing is, whatever they choose, some group will like it a lot, while other will be meh, and other will dont like it.
Yep you right.
There is no arguing about matters of taste. And it's impossible to make something that everybody love (even if you try again and again, it's still impossible to have a 100%, the best is to try to get as close as possible)