PS4 games now available to preorder through PS3

PlayStation 4 games are now available to preorder through the PlayStation Store on the PlayStation 3, as well as the Sony Entertainment Network (SEN) store, the company has announced.

The first two digital PS4 titles available for preorder are SCE Japan Studio's Knack ($60) and Digital Extremes' multiplayer shooter Warframe (free).

The PS4 launches on November 15 in North America and November 29 in Europe. One of the platform's previously announced launch titles--Watch Dogs--was recently delayed to spring 2014.

Sony previously announced an official launch-day Watch Dogs PlayStation 4 bundle that would include a copy of the game. With the game delayed, a Ubisoft representative told GameSpot, "Our partnership with Sony remains strong and we will have more details to share about the specific benefits of this partnership for PlayStation customers at a later date."