Hello,
I read the comments here directly to Allen a couple days ago (I was searching to see if a US News & World Report article he was interviewed for was published yet [it hasn't] and this came up) and he asked me to post an update here.
As I type (Sunday, 5/20/12, 6:56pm) he is scheduled to begin surgery, as a donor heart was found! This will take about 9 hours, if the heart passes further inspection by his doctors at Cedars Sinai.
To back up a bit, his progress this week has been great; he seems to be back to his old self.
Also, he really, really appreciates the comments here, he said they were so nice!
Thank you,
Marc (friend of Allen and his family)