According to the Saturday 25 June 2011 edition of the Deseret News, President Packer has been given a pace-maker implant in his heart.
This begs the question of how long President Packer has left until he is taken home to his eternal rest? I presonally give it four more year (when he turns 90 year old), seeing now he is 86. The Lord might have other plans in mind for him, but I don't think he'll be made President of the Church. President Thomas S. Monson was 80 years old in 2008 (when he became President of the Church), and is now almost 84, and, I think, quite robust and full of vigor. Now don't get me wrong, I love President Packer and have been a fan of his forthright speaking abilities and general wisdom for a long time and would hate to see him go.
Nevertheless, whatever the mind of the Lord, He will do it right, because He knows who will become the Prophet. I hope President Packer makes a full recovery and has many more years of service left in him. I know he is a true Apostle of the Lord Jesus Christ. In the name of Jesus Christ, amen.