This is what we found on Wikipedia regarding the Soft Launch:

A soft launch, also known as a soft opening, is a preview release of a product or service to a limited audience prior to the general public. Soft-launching a product is sometimes used to gather data or customer feedback, prior to making it widely available during an official release or grand opening. A company may also choose a soft launch to test the functionality of a product, allowing adjustments to be made before a wider release and marketing efforts are implemented.