Thank you, thank you, thank you. I just purchased my iPhone today 2 hours later noticed that it did not show a camera icon. After searching the apple site and coming up with no answers I decided to browse the discussion forums with positive results. Camera icon restored.
You may try to install "bossprefs" from cydia or installer and go to hide icons menu. If it's not there, then try "ssh" connecting your iphone and check camera app folder for icon.. I hope, it will help you.