It is a catch-22; we want transparency as investors, but any pictures of the actual data center also compromise security.
If you trust ASICMINER, then you have to trust them they also have sound security measures.
If you don't trust them, then you shouldn't buy their shares anyway.
Either way, they shouldn't release information compromising security, then.
That said, a statement such as "don't worry, we're aware of that, everything's ok" would be nice.