Quick idea that came to mind, we need a new item, spell or interface, with a simple, yet clear UI that shows every weekly quest you have available, and let you pick it on the go.
For example the 2 dungeon quests, the 3 pvp weekly quests, the 3-4 profession quests and things like that.
This should could only be available for players who has reached certain reputation or achievement in the expansion with their main