Yeah, I just got that email too. The case is a bit different with the Old School 2.0 shirt, they said that one didn't even show up for the initial launch.

I got that information from another guardian haven't got an actual reply from Bungie but I did purchase that shirt. So in helping you you helped me

Here's the body of the email FWIW, "Hello James, I'm sorry for the unexpected delay with your order. Thank you so much for your recent order with the Bungie Store. We're thrilled that you are excited enough about the release of The Taken King to help yourself to some new gear. Unfortunately all orders containing Old School 2.0 shirts are currently being held as that item did not arrive in time for the product launch last week. We should have the shirts in hand soon and when we do we'll get your order on the way as soon as we can. We hope you’re as excited about The Taken King as we are! Regards,"