Select "Program and Exhibits" from the top menu and you'll find "Prelimnary Program Schedule" offered near the top of the left menu.
If you want to refer someone there, you can use this link: http://www.cc26.info/show_prelim_schedule.php which actually redirects to the correct page.*
The schedule is still subject to massive changes, of course, but the online view is generated directly from the latest input to the program db, so it's always fresh.
*(Geekery: the redirect gets around the issues the secure server has with drilling down directly into the secure part of the site)