Below text taken from the following page: http://www.mileageplusmergerupdates....nefitsExtended



Part of the merger between United and Continental involves converting to a new technology system, late in the first quarter of 2012. At that point, we'll begin delivering the benefits of the 2012 MileagePlus® program. Until then, elite members' 2011 status and benefits will be extended. We will extend the validity of elite credentials as well, so elite members will continue to enjoy their benefits when flying on United and Star Alliance™ member airlines.
In late January, we'll provide more details about this extension period, including the specific expiration date for your 2011 card and status. We'll also have more details to share about when we will send 2012 credentials to qualifying members.