The new Interface System (NIS): It basically lets you completely personalize your entire interface according to OSRS gold the way you want it. It's confusing initially, but once you've found the perfect interface for you, you'll be wondering why this wasn't introduced sooner.
Bonds: Purchase 14-day membership using money from the game. Pretty cool if you don't feel like paying for members. The Sixth-Age has started It's not a spoiler for you, though I highly recommend you do 'The World Wakes' quest before doing anything else. Go to 'Missing presumed death'.
HTML5 It's a good thing that HTML5 Runescape is currently in beta, it's a significant forthcoming change in the game. Better graphics, improved camerawork, draw distance, etc. These are just a few advantages of this. This is not to mention the benefits of switching away from Java is a horribly unsafe piece of softwareand)
Divination: New skill go south of Draynor to get started. Innovating: New skill to be released in 2014. World-Events: Something related to the Sixth-Age (do the questions I mentioned in order to grasp this) in which Gods fight each other in Gielinor with the winner chosen by the players. The first was the Battle of Lumbridge which featured Zamorak against. Saradomin (Saradomin won) The second event currently being held is that of the Bird and the Beast which is Bandos against. Armadyl (the loser of the battle dies).
This is all I can think of at this moment However, these are the majority of the major changes in the game. If you're looking to find out more about the changes that runescape 2007 gold will be happening in 2014, look up THIS Reddit thread which summarizes everything that transpired at RuneFest 2013.