As Punknews.org suggested in the original signing announcement, current AFI and former Son of Sam vocalist has declined participation in the upcoming version of the band.

Todd Youth explained:

I’m not sure if you heard but me and Steve are working on a new Son Of Sam record,we asked Davey but he declined,which is a bummer,but we understand and he gave us his full blessing with looking for a new singer.There’s been some speculation on some of the Danzig/Misfits message boards who the new singer is going to be,I’ve heard Michale Graves,Matt Skiba,ect.ect,but we found someone who fits perfectly with the band,but we’re going to keep the singer a mystery for a while.

The band’s sole previous album, 2001’s Songs From The Earth, was recorded with Havok.
Source As Punknews.org suggested in the original signing announcement, current AFI and former Son of Sam vocalist has declined participation in the upcoming version of the band.

Todd Youth explained:

I’m not sure if you heard but me and Steve are working on a new Son Of Sam record,we asked Davey but he declined,which is a bummer,but we understand and he gave us his full blessing with looking for a new singer.There’s been some speculation on some of the Danzig/Misfits message boards who the new singer is going to be,I’ve heard Michale Graves,Matt Skiba,ect.ect,but we found someone who fits perfectly with the band,but we’re going to keep the singer a mystery for a while.

The band’s sole previous album, 2001’s Songs From The Earth, was recorded with Havok.
Source