Not too many "major" updates, but JaGex has most recently released Within the Light quest. The Ardougne Achievement Diary has also recently been released, as well as the Halloween event.

You can woodcut
Ivy now in various areas, use the sawmill in different ways, store pets in your house using a Menagerie. In the Living Rock Caverns, you can fish new things, and mine other things more quickly.
Forgiveness of a Chaos Dwarf has also been released, opening up an area in northern Keldagrim for mining (also, a lot more quests have been released). Most importantly, they released on the 1st of October the ability to change names (display names). If you weren't here for it, they also released Mobilising Armies.
I supposed you mean the upgrade to Runetek 5? Even with lowest settings on Standard detail, there's not much you can do about that.