I know a lot of people are confused/frustrated with the lack of new buffs... Why not a quick release of more buffs like Holy Flame that are Creature type specific? Not game breaking, and can be used on specific creature types.
Why not something like "Boil" for Aquatic (with a icon of a pot with a kraken arm hanging out of it), Grill Meat for Beast type, Grapeshot for Avian, Titanium Arrow for Dragon, Corroding Wind for Mechanical, and Caltrops for Mounted? Some would be stat de-buffs (like Caltrops for Mounted adn Corroding Wind) Some would be damage boosters (like Titanium arrow and Boil).
This would also give a rationale for new creatures to be added to lower level realms of these types. (Elites/Champions) that give notably more xp as their stats are much higher. Also could be somethign that for each one there is a new quest for those areas as well.
Just a few ideas, thoughts on some class type buffs that new content and quests could also be built around, along with ways to give a boost in xp for lower level players as well.