The Wall Street Journal reports that Apple CEO Steve Jobs received a liver transplant about two months ago to treat some ongoing complications from his previous pancreatic cancer:

Steve Jobs, who has been on medical leave from Apple Inc. since January to treat an undisclosed medical condition, received a liver transplant in Tennessee about two months ago. The chief executive has been recovering well and is expected to return to work on schedule later this month, though he may work part-time initially.

The exact source for the information is not provided, though The Wall Street Journal is reporting it as fact and not rumor. They also state that he is recovering well and is expected to return to Apple at the end of June, though may initially return on a part-time basis.