Will there be any additions to Character Creator that allow us to desingn our own personal classes and/or races? I've got some ideas running in my head, but Character Creator isn't allow me to put it all together to see how the mechanics may work.
There's supposed to be full support for homebrew material in the full release version, which is tentatively being expected by the end of this month.
So, assuming you're a subscriber, you should be able to use your own homemade races and classes with the Character Builder, as well as feats, powers, paragon paths, epic destinies, and magic items (and maybe other stuff too) a month from now.