Seems like wxWidgets 3.0.2 is working just fine, at least for a casual "Hello World" test...
Put both versions up for Homebrew, so that you can compare (but the wxGTK track is dead).
https://github.com/afb/homebrew/tree/codeblocks-gtk (wxGTK, X11)
https://github.com/afb/homebrew/tree/codeblocks-osx (wxOSX, Cocoa)
brew install --HEAD codeblocks
I had to patch the plugin manager, it was trying to load *.dylib from share/codeblocks directory.
It *should* be loading *.so from lib/codeblocks/plugins dir, just like on any other UNIX really.