Well, I really don't care as long as Opeth releases another kickass album. They always do anyway, and they surprise me. Sure, Deliverance wasn't as good as the rest, but I still enjoyed it. Either way, Steve's voice can be really annoying at times. When he began singing in the documentary and just cacked myself laughing because he sounded so high, like a teeny bopper. His voice in Porcupine Tree is so much better.
It'd be interesting to have Per Wiberg as the 5th member, but don't count on it I guess.