Of course, there's no way you can tell from the outside since it looks like an ordinary https connection to an ordinary server. Then again, I can think of more ways to implement end-to-end encryption over wiretapped channels without it being obvious that encrypted data is being exchanged (stego is quite easy to make but very hard to detect if you don't know the method). So the whole ban is pointless.
Terrorists and other criminals have an interest in arranging this, and it's quite easy, so they'll succeed. The general public will not care enough, and any widely used end-to-end solution will be banned anyway, so they'll just have to give up a little bit of privacy. No gains but at least the government is trying, right?