He just provided vocals for that album and played some shows with the band. Not sure if he will be on the next album, but hopefully he will be because he sounded amazing.
Also he has another rock band called Piano. They have two EP's out (the first one is more post-hardcore) and I think they are writing for their next album.
I dig all his shit except his time in TesseracT... For some reason, I just couldn't get into him then... But the latest Skyharbor album is so fucking sick, it's ridiculous.