Where did redirection go?

I just upgraded to alpha13, and I notice that redirection is no longer working.
* In the edit form for a site, the redirection field has converted the "checkbox" to a "hidden" field so I cannot edit the parameter.
* Also, the database table "hosting_site_alias" has a redirection column and my sites are set from before, but this has no effect.
* Upon investigation, I notice in provision/http/apache/vhost.tpl.php, the redirection code is commented out.

What has happened, and how do I enable my sites with aliases to redirect to the main URL again?

Thanks for the awesome work!