Ninja Pack 3 and the SK pack were available on Monday late at night for me (like 10:30 p.m. Central Time (GMT-6)) so maybe the same thing will happen here.
Also, the Last Getaway Set's up for sale now on XBL. No idea if it will download yet or not. $24.99. I'll shop around now to see if getting the other DLC packs separate is a better deal seeing as I already have Ninja 2015 and Aloha due to preorder. I'll have to wait though, since as far as I can tell only that pack and the individual costumes are up for sale. All other sets are only displaying "Pin to Home." It's a saving of $2.86 over buying each individual costume I don't have, but if I can save more, I'll wait. For people that don't have any preorder DLC or just Ninja 2015 (which I don't think was possible, feel free to correct me if I'm wrong), it's a savings of $6.84.
Edit: Premier Sexy Set is also up for sale and download at $14.99, and I think they just made it available as I didn't see it earlier, and the content is not listed in the Last Getaway Set.