Yes. For some value of Christmas.
For international pledgers, Christmas 2015 is probably not going to happen. We'd have to pay three times the shirt price to get DHL to rush them over.
For US domestic pledgers, we're going to work hard to do that. Once the campaign reaches its goal, we can get the size info and put the order into the t-shirt makers. From there it depends on how fast they can get the shirts to us. As with many Kickstarter projects, you'll see that the delivery of the physical items is out of our hands.