User blog comment:SociallyAwkwardEpic/GTA V - Business Pack DLC announced./@comment-4360975-20140228200827/@comment-1479503-20140301164732

"except that the items will be available to redeem in the game long-term, not just temporarily."

In other words, it will be updated and purchasable just like the Valentine pack was, only this time it won't be temporarily avalible and you will be able to purchase it at any time. So no, you don't have only a month to get it, like the Valentine's stuff.