Ubisoft forums announces that open beta testing is now underway for Rainbow Six: Siege, as they have cleared up the issues that caused them to delay things. Word is:

We want to thank everyone who is participating in this beta. Your feedback helps us improve. For everyone who hasn’t been able to play as yet, we apologize for the inconvenience and we appreciate your patience and understanding.

We are proud of what Rainbow Six Siege has to offer and we wish you the greatest experience possible.