If you miss hearing John's voice in your head (as you read his now "older" works) then you might want to consider this recent offering...
I had a few reservations upon hearing about it (somebody's cashing in on John's recent death?) but they've been allayed quite nicely by the author. I'm going to be reading it on a long trip starting next week, so I've only read a few pages but...it sounds like a winner so-far.