Well, theres a new PVP system update which I like. It's basically old school pking, but with a really rare chance of good drops. You can fight anywhere in Runescape with the exception of a few mini games on PVP worlds only. It's a great aspect to the PVP system, although, old wilderness would be better.
Soul Wars is out. This is another new mini game, which is based on red team and blue team. The job of each team is to kill the other persons avatar. You can weaken the avater by using soul fregmants on the middle obelisk. The level will go down, and whatever the level is the slayer requirement you need to kill the avatar. The teams who's avatar has the most deaths in the end, loses.
For Soul Wars rewards, you get zeal. You can spend it on Experience, items, or random items similar to how Barbarian Assault gambling works. For a loss you get 1 Zeal, tie 2 Zeal, win 3 Zeal.
Thats about all I want to explain.