[Meads]

Actually the only thing that has changed is, that you can now map Buses directly to a phyiscal output (I don't know what for, though), and you don't have to click into the matrix anymore to define the buses. You simply create one, and choose if it's supposed to be mono/Stereo/etc. Then it just sits there - which is a good thing, actually.
You're still able to route ins and outs of tracks to buses, just like you always could. Nothing has changed here.