Visit the Heartland Closed Beta registration site to sign up for a chance to get in; note that this test is only available on PC to players in the United States, Canada, or Mexico.
Players who get into the beta will have to sign a non-disclosure agreement and refrain from sharing their thoughts or gameplay publicly, but they will be encouraged to share any and all feedback with the Heartland development team. The goal of the test is to get input from the community; if you want in, register on the official Heartland site and keep an eye on your inbox as invitations will go out progressively over the coming weeks.