Count me excited. I've always liked the book, but I've also found it fairly lacking in ways I'm not sure I completely understand, I can likely lend part of that to my relative inexperience with Rust and systems programming in general.
One I can note is that I really like the new sections. I've never quite liked that the current book is just a bunch of chapters all in a row. Not that that's necessarily bad in and of itself, but I do think the new way is better.
Both would be ideal, if you have the time. The new book is far enough along that you can learn the most basic stuff from it, and the intermediate bits are coming along. The more advanced stuff is only
an outline. So if you start with new, and then switch to old, you'll get the best of both.
One I can note is that I really like the new sections. I've never quite liked that the current book is just a bunch of chapters all in a row. Not that that's necessarily bad in and of itself, but I do think the new way is better.