There seems to be a lot of misinformation and fud spread about blockchain.info recently. It still seems fine to use though they did have minor problems that were sorted (I think) and they were removed from the Foundation site but they don't seem to have given any reasoning for it other than others speculating on why.
And that mail you received is a blatant phishing scam.
It was a big screw up by them, and its still ongoing. The white hat hacker we have is doing the best but blockchain.info seems incapable of fixing it.
hilariousandco, if you are talking about Johoe's find, then nope it is not a FUD. The users haven't done anything wrong to my understanding, but it is a bug on blockchain.info because of carelessness or incompetence or malicious programmer.