If you don't feel like rushing to the store and putting down $5 on a pre-order for Knack, you can now do so from the comfort of your own couch.
Sony has just announced that pre-orders for their digital games have just went live. However, the only two titles which you can pre-order are Knack and Warframe, the latter which is a free game.
It's good to know that once you do get your hands on your brand new PS4, which is exactly a month from today, you can potentially start playing Knack immediately after setup.
You can check out the two games here, and pre-order that Warframe. IT'S FREE!