At this moment, after this response from Guy, I believe that the next album could be one of the last, if not perhaps the last of Mark. Even though Mark says he likes to write and record songs I'm not so sure he can record them, maybe they might just stay as lyrics. And I am very sorry about that. 
But why?
Mark certainly has no pressure with the new album, huh? Everybody's waiting for his retirement, possible tour, the release of a biographical film, small tour or shows, the last album maybe. Who knows? Any album can be the last, this may be my last message here for all I know. Life is too unpredictable.
My only hope is that all this pressure will not result in a huge disappointment. And I hope that long waiting means that they understand that, too.