Exactly. I couldn’t get Avian to compile since for some reason the JRE w/e grew in size and thus we currently have no way to bring 3.1 to iOS. You could hack in the avian release from 3.0 into 3.1, though, I guess.
As the web server situation broke the updates.jmonkeyengine.org domain I guess its impossible to install the iOS plugin in the 3.0 SDK (or update it to 3.0.10 for that matter).