http://runescape.wikia.com/wiki/Game_updates for the full list
Other than that, there are two other things that have made my life easier within the last few months;
You can make the vials left over from potions destroy themself after you deplete the potion, so you don't have to drop them during a fight. (Like flasks!) You can toggle this functionality at the decanting dude at the varrock grand exchange.
Instances don't close after you leave them now, so your 200k Araxxor instance, or 150k with the reaper bonus, will now last you like 8 kills solo :~)