Mamasan Bren posted this yesterday on the PearlJam.com forums, he met Mike McCready at a Flight to Mars show in Las Vegas:
Following up on the Mad Season news from that interview, [Mike McCready] does have a commitment from a singer now. I have to say that a billion Coronas and a stiff rum and coke wiped out the name he said. I want to say a Lanigan or Flanigan or something like that, but am just not able to recall, but he said that he was pretty much lined up to record for their release later this year. Also, that the work with Sony to free up the rights to some of the unreleased tracks was definitely in progress.
John posted this on the PearlJam.com forums a week ago:
Well I just spoke to Mark Lanegan last night and I posed the question of his potential involvement in the upcoming Mad Season projects and he said “Yes. I will most likely being doing some stuff with them.” I had to ask. There is an answer from the man himself delivered with a magnificently sly grin.