Right arrow
Actually, it's a trend in industrial controls as well. Make everything shades of grey except things that are out of the ordinary or changing. Draws your eye to the important stuff, and the rest fades into the background. The text is white on dark grey, so it's just as legible as the old white/yellow on blue.
I find the new interface more legible over all, aside from the few cases of disabled items (grey on grey)
UI functionality appears to be pretty much the same to me. Just need to learn how it works. The arrows do a lot more than they used to, and Left now longer backs out, so you use a different button for that. To me, it's really the ads that ruin it more than the navigation.
You still have a choice on the older boxes. But that could change at any time.