Just looked through the latest Runescape "Behind the Scenes". Lots of interesting updates to come, here's the ones I think matter the most.
From Runescape: You'll be able to set up your own chat channel that you and your clan-mates can use to keep in touch with each other, as well as being able to rank the members in your chat channel, control who can talk, and much, much more.
Updates to some item's description.
Making dangerous areas look more dangerous.
A big update to the choice of clothes for our players. Also, during the first week of release, all changes to appearance will be free!
A new column will be added to the world select screen showing which worlds are commonly used for minigames etc.
New God War dungeon.
Unsure if the dungeon will be part of a quest or just a new area, but apparently will feature extremely powerful followers of Zamorak and Saradomin. Also, there will be a massive Bandos army, which sounds exciting.