The following info is from Wikipedia, so take it for what it’s worth.
I do know that a lot of the information is accurate, but until the last part is confirmed…
On December 11, 2009, Bobby Heenan was hospitalized at the H. Lee Moffitt Cancer Center in Tampa, FL after an examination of his rebuilt jaw found an infection that needed to be treated. As a result, Heenan missed his scheduled appearance at the K&S Wrestlefest event in New Jersey.
By 2010, Heenan's jaw infection was completely eradicated. He appeared at TNA Lockdown fanfest on April 17, 2010. Heenan's Speech is now hard to understand, but he still has that look in his eye that brought him his fame.
In December 2010 WWE will release a retrospective of his career.