It's not recommended to install phpBB 3.2-RC1 on a live board right now. It is still in a test stage (RC means release candidate) and there are some known bugs that would prevent you from properly using all the functions that phpBB has to offer. You'd be better off waiting for an official release to come or just use our stable 3.1.x product for your new board, which we still completely support and will for some time.
If your question was when exactly the stable version of 3.2.0 will be released, we can't answer that unfortunately. You'll have to be patient, I'm afraid. But I can assure you we're working hard at it.