The WSJ reports that Steve Jobs received a liver transplant in Tennessee approximately two months ago. They also report that Jobs is recovering well and is expected to report for duty at the end of the month.
The site goes on to speculate that Jobs could have had a recurrence of cancer. Without any real proof, this is just speculation.
Regardless of whether or not Steve had a transplant, we'll be happy to have him back at Apple and wish him the best.
Links:
[1] http://www.maclife.com/user/rbaldwin
[2] http://www.maclife.com/article/news/jobs_said_be_recovering_liver_transplant
[3] http://online.wsj.com/article/SB124546193182433491.html