GitHub is offering a promotion where new users can experience a free month on all paid plans if they sign up immediately, providing an incentive to explore its features without the need for a credit card until January 1st, 2009. Users have the flexibility to cancel or downgrade to a free account before the trial period ends, making it an attractive opportunity to test the platform's capabilities. The announcement, penned by PJ Hyett, encourages potential users to take advantage of this limited-time offer and discover what GitHub has to offer.