For what it's worth, I've got my 5S in the lifeproof Nuud case that I had for my iPhone 5. Obviously TouchID doesn't work, but that's not unexpected. There's no problem just entering the password when it's in the case, even if TouchID is enabled.
The flash isn't bad either... it's probably at least 98% visible through the flash window in the Lifeproof case.
I'm hoping Lifeproof can come up with something brilliant to allow TouchID to work while the phone is in the case, but for now the iPhone 5 lifrproof case is working fine for me.