So, pre-sale tickets are weird beasts.
Promoters and venues start selling some events early, especially popular events.
The issue is that often the promoter or venue won't have printed those tickets out yet, and just as often won't have a set date that they will be printing tickets for delivery. This means that, although your seats are secured and will be the best ones available, you'll have to wait to actually receive them.
If the event is on pre-sale then congrats! You've most probably got the best seats, but you'll need to be patient. Once we receive the tickets, we'll contact you and arrange for your delivery.