All of these redesigns are a parts of projects to make the site more user friendly, attract new users, and I've noticed they are more friendly to mobile devices. While this is interesting, it may be a long time before we see any of this--if we do see it released.
I first became aware of this kind of look during the Kinfolio beta and designing of early last year:
FamilySearch Photos (LDS beta) uses roughly the same kind of look (which is also the same look that is being tested for a new home page design):
Here are some screenshots of the new home page design as they have evolved over the last two weeks. I have seen 3 new designs in this time.
The next design:
Here is the latest version: