Ok, let's assume everyone knows who The Beatles are and will never forget them or their music (and above a certain age that is a more than reasonable assumption).

So the teaser banner said: "Tomorrow is just another day. That you'll never forget."

Post announcement, you can read it as: "Today is just another day that you'll never forget The Beatles."

Which is true (even though it was deceptive... but it was just a teaser banner on a website after all).