You can grab a beta build of Acorn 2.2 off FM's latest build page.
What's new? Bézier curves, zoom/rotate/undo gestures using the trackpad, a new "Scale Transform" command which acts like the normal transforms but just does a good job of scaling (and rotating), faster startup for folks who don't have any Python plugins installed, new "Advanced" prefs pane with new settings and stuff, reimplemented Flood Fill using OpenCL (better, faster, stronger?), handles for shapes now draw outside the canvas, and many other little things.
Bézier curves have been on the todo list for a long long time, and I'm happy I've finally got something started. It doesn't do everything that people will want, but as time marches on I'm sure more features will be added to it.
If you have any feedback or bug reports, please write firstname.lastname@example.org!