The new address is a mailbox address behind a security gate. No one can get in. Even if someone got in, no MtGox staff would be there. No other company there expects visitors in person so no one cares how big of a neckbeard army accumulates outside.
It is bad news.
An excellent post.
Your last sentence may need reversal. Running a large bitcoin exchange out of a well known location without much security was an enormous, unacceptable risk. What they are now doing to physically isolate themselves more from the general public can be seen as long overdue.
I don't think it can be good news at all, because the way Karpeles seeks to isolate himself and staff from any possible confrontation implies that he knows things are going to get much worse. If they were going to get better then they wouldn't need to do this. It seems like a pretty insane time to be spending time on an office move instead of on fixing the issue - unless a fix is hopeless.
I'm sure the servers will be in a datacentre that's not even on the same continent as Karpeles - I haven't looked. Due to the constant technical and (software) security issues that MtGox has had then no doubt their security isn't the best, but at this point I suspect that is the least of their worries.