IDL 8.2.1 has been released:

Last, an editorial. Though 8.2.1 includes bug fixes (52 CRs closed), we’re also adding several new features, so it feels like more than just a maintenance release. I think this is a result of us getting better at the “release early, release often” software philosophy.

I'm downloading now.

UPDATE: note to Mountain Lion users—the Mac installer is not signed, so Mountain Lion will refuse to install it if you haven't changed your defaults. To do a one-time bypass of this, right-click (or control-click) on the installer to get the popup menu and select "Open". That will give you an option to install anyway.