I've submitted Acorn 3.2 to the App Store, so the ball is currently in Apple's court for getting that update out. If you bought Acorn directly from FM (or maybe you're just impatient) you can download it from the latest builds page.
Earlier today I was working out some bugs with the vector tools, and ended up making these little icons in Acorn (version 3.2):
Ovals, rects, bezier paths, and gradient fills. It's fun what you can do with some simple vector tools. Here's the original acorn file if you'd like to peek at it.