If you want to, you can pre-order Ready now and simply click the "ship with next 'normal' order when available" option in your cart. With that option enabled, you don't pay for shipping! Before the 15th we will contact every backer to ask them which flavour(s) they would like and you can switch yours to all Carrot Break if you'd like.
If that's done you can just place a Steady-order (after the 15th) and the Ready will be added automatically as that would be your next 'normal' order.
Another option would be waiting until Carrot Break is available in the regular shop, for the regular (higher) price. This will be after the 15th of December, indeed!
Hope to have answered your question