The latest version is the second version that supports Delphi XE3 (yes, you missed one).
Apart from being based on the latest GExperts sources this new version also contains quite a few bug fixes to the formatter which should support nested class declarations. All my existing unit test cases for this work.
If it does not work for you, please send me a bug report and attach a source file that contains the formatting you expected. That file should be a compilable Delphi unit, not just a class declaration.
Head over to the Experimental GExperts page to download the new version.