Before the DNS is changed you can use FrontPage FTP publishing (or another FTP client) to publish the site to the FTP address of your web site account. But you can't use the FrontPage HTTP publishing to publish the site to the temporary HTTP address.
Additionally, some of the features that require the FrontPage extensions such as FrontPage forms will not work until the DNS is changed and the browser goes to the regular
http://domain.com address.
When publishing the site using FTP, take care to place your files in the public_html folder on the server.