There is an interview with Michael Mann on the Vanguard official site, where he gives insights into the upcoming Game Update 4.

What areas within the game have you worked on? What are you currently working on? Can you give us any hints as to what's coming after Game Update 4?
I work on player classes for the most part. I'm mainly responsible for the Dread Knight, Blood Mage, Disciple, Sorcerer, Druid, Necromancer and Ranger. I have also worked on most of the other classes at one time or another and have dabbled in the harvesting system, overland raids, NPC abilities and class quest stuff.

I am currently working on answering questions for this interview and getting the Druid, Dread Knight and Necromancer adjustments, as well as the Shaman patron quest stuff ready to go.

In GU4 you will see quite a large change in the way a Druid functions. The druid will be focused more on using their special spells called Phenomena. These spells have been improved, cost less and are available more often. This will increase the damage a druid does and fix bugs associated with the class. Other things to look for include Dread Knights using 2 handed weapons to fulfill their tanking roles and Necromancers having more focused choices with Lich and Wraith modes.

That is only the stuff that has to do with classes I have worked on, things other people have done include helms, the riftway system and many other great additions that are in store for GU4.

Read more here.