These have all the things that landed in trunk so far in this cycle of development but developers still work on many things like High DPI support and Unity Lockscreen.
You will notice that there are also things that Sam Spilsbury been working on but it doesn't mean he is back contributing. Those things were originally worked on by him and know the current developers of Unity and Compiz made them applicable to the new codebase.
These will also bring up the new Unity decorations which should also resolve a long standing bug: Panel should be right-clickable when window is maximised with global menu enabled.
Also as you can see the right-click menus on decoration in Ambiance are black just like they should be from beginning.