Jonathan recently released two tracks of his solo album up on SoundCloud. You can listen to "Happiness" & "Medicate" (also known as I Medicate Everyday) here:
http://soundcloud.com/jonathandaviskornAs for news on the solo album, Jonathan has said that it's ready but the people responsible for it's distribution aren't getting back to him on anything so in the meantime he's been writing while on tour and has come up with at least 30 more tracks or so.
He'd like to release it later this year if possible.EDIT: A new song titled "Final Days" has been added.