Vector Glass, DPI Scaling, Desktop Aurora - Where/When?

Hello All,

I have been doing some reading about Beta 2 and I hear people commenting
about the items mentioned in my subject, Vector Glass, DPI Scaling, and
Desktop Aurora. I am trying to figure out what exactly they are, my
thoughts:

Vector Glass: From what I read, the current builds released are based on
PNG Glass, so raster, but future glass is supposed to be drawn from the
Vector engine and it is unknown if this is going to make it into Beta 2. My
questions around this is, how different will it look, and any other details
someone wants to share!

DPI Scaling: I see this in the a few newer builds, but it seems broken. I
remember people talking about the extreme high-res displays coming out in
the next few years, and that dpi scaling could be used to "Scale" windows
larger, not just resize them. Has this changed to just a system wide
setting? In its current form graphics tear, and just looks bad.

Desktop Aurora: I read about this on a forum post, about new desktop
wallpaper like animations, and some explorer task bar animations, real time
pretty moving backgrounds - I like it! Is it coming back, it has been
removed since very early builds.

Thats all!

Ryan