I just got onto the PTR and I noticed they changed the map panel. It now looks like this....



When you left click on a quest it shows the quest as normal at the bottom but as well as this the quest name and number go yellow and stay highlighted. This is just a guess, but I don't see any other reason for that function unless you are tracking quests (the highlight) seeing as you can de-select the quest and still see the quest text below. And the fact that the quest log has been moved to the map, implies that there is a link between the two.

If you click on the green square it minimizes the map a bit



Enjoy, Ill edit in if I find anything else.