UPDATE 1: A list of folks who have reportedly visited the Ayatollah include the Supreme Leader, the President, the head of the Basij, Khomeini's grandson and others.
UPDATE 2: Ahmed Khatami, the hardline cleric evidently cancelled the upcoming elections to replace Ayatollah Mahdavi-Kani. Ayatollah Rafsanjani was a (the?) favorite to replace the comatose Mahdavi-Kani, despite habitual and continuing persecution against Rafsanjani and his family from regime insiders.
UPDATE 3: Ayatollah Mahdavi-Kani has died according to multiple sources (PressTV, Fars etc). It is unclear what steps will be taken to replace him, if the acting chairman (Shahroudi) will be promoted, or if there will be elections.