Koei Tecmo has released a free update for Winning Post 9 that includes the addition of online play, letting players race head-to-head with other jockeys. There's also a ranking function that lets you see where you line up with the other online players out there. The update also includes various tweaks and fixes to the overall experience.
Along with this update 5 new pieces of paid DLC are made available as well. This DLC will let you change the colors of the ponies that are raised in your stable. The designs include zebra, appaloosa, red, cheetah, and okapi.