It's probably more helpful to post on the UCSF School Specific thread, but what was said there was (some people called and asked...) "no news is good news". UCSF adcom told them that if you weren't accepted that day, they sent out all their rejections on that day, too. So if you haven't heard back, you're most likely waitlisted, or there might be a chance of acceptance when the next wave goes out.