According to the ingame news, this was all added two days ago. But I didn’t get it ’till today.
You can get the update by, simply updating your client and looking in the ingame news. There you can read the massive list.
The most useful things I’ve read about this update, are adding an imp inventory window that shows what tool or object that needs to be used to imp the tool.
For example, take an iron saw. It will show a pelt icon, showing you can use a pelt to imp this tool. Very useful. 🙂
Another thing I found interesting is hearing about these new “shaker orbs” you can buy at a trader that are used to collapse a mine. I desperately wanted something like this when it came to my old HS. They are aware that griefers could use this.