in a week it should be ready. Incase you have updated, and you want come back to 1.3 message me on steam and I will give you the 1.3 mc jar file.
Not sure how long it will take but I dont think it will take as long as a week tbh because there was a preview version... Anyway once you start seeing 1.4 version here: http://dl.bukkit.org/downloads/craftbukkit/ Let me know Message from devs: http://forums.bukkit.org/threads/when-will-craftbukkit-for-1-4-be-released.107128/