Still no word of whether the rumors regarding Khamenei's health (and possible death) are true. Interestingly, after three days of hearsay, there has yet to be any official denial from the Supreme Leader's office, or from the IRI itself. Also, as Enduring America aptly points out, the conservative daily Kayhan (which is essentially the mouthpiece of the Supreme Leader) has not published since Monday.
Whether Khamenei is still conscious, in a coma, or dead, my impression is that something has gone astray at the top of the regime's hierarchy. Nonetheless, developments (and of course rumors) should be treated with caution until otherwise verified.
UPDATE: Unconfirmed reports now say that streets surrounding Khamenei's residence in Tehran have been cornered off and are packed with a heavy police presence.
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