On the current tour with Hail The Sun, they have Andy Cizek on scream vocals. He's the vocalist for Makari and Monuments. I got a couple of videos from it I'll be uploading soon. The dude really nails it. If you can make it out to a show, HIGHLY recommended!
Technically still ALLB, since they still have Kurt, Joseph, and Michael. Cory is definitely missed, but Matthew does a great job on his parts! They also have Greg, who does Secret Gardens, which is a huge bonus, as a fan of his work.
Hey! His absence is really sad but the motive might be more. It seems that he is out of music industry and probably won't come back. His last work that I know is an album called Sufferer with many other unclean singers.