Since nobody else has mentioned it (if it matters), the background color of the bezel now matches the Yosemite menu bar. If you use the light menu bar style (the default) the bezel will be white, like in those screenshots. If you use the dark menu bar, the bezels are black to match.
Oh good observation. Didn't notice that.
They look horrendous. The black bar looks like it should be inverted and I'm hoping it's just a temporary oversight. Apple should ditch the blur effect on toggles like these, especially on iOS where they cover so much of the screen.
Yes they are more consistent, but like in iOS they now distort the content behind them, which can be extremely frustrating.
Think they're great, but I find it visually odd that the volume/brightness slider graph is square instead of 1 or 2pt corner radius. Minor details though.
It's good to see consistency between iOS and OS X.