Why should you wait? All the beta updates have left the installation untouched, and simply provided newer and, at least as far as I can tell, better drivers. Install it, see if you like it, and when Leopard comes out, if you still like it, you'll probably be able to simply update the drivers and be happy. And remember, only the earliest versions "expired" recently. The web page tells you to update to the latest version to continue using Boot Camp-and that should be just the utility, not the partition it created.