If you've been playing Warhammer Online at all since launch day, you're probably aware of how popular Scenarios have become with a lot of players. Scenarios are in fact so popular that Public Quests and open world RvR zones have been suffering a bit. You can bet that Mythic is hard at work on figuring out how to entice players out of constant Scenario grinding. The 1.1 update announced recently is a first step towards reinforcing the draw of open world play by adding a PQ-like influence system for open RvR zones throughout the game. Of course that's only the beginning.
I imagine we'll see some future updates to the keeps and what they give guilds and players who use make use of them. There may also be an enhanced siege system, since the one in the game right now is a bit limited. Another update will be to the PQ system. The best improvement would be if Mythic could figure out how to make them scale a bit to the amount of players involved at any given moment.