Not really heaven, and certainly not Christian heaven, but in an interview with Jeremy Paxman, Hitchens did say that he if he would find himself alive in any way at all, that would be a pleasant surprise. (This is not to imply he believes in or hopes for an afterlife, claiming that would be absurd.)
Christopher Hitchens: "No. I'm not afraid of being dead, that's to say there's nothing to be afraid of. I won't know I'm dead, would be my strong conviction. And if I find that I'm alive in any way at all, well that'll be a pleasant surprise. I quite like surprises. But I strongly take leave to doubt it.
http://www.bbc.co.uk/pressoffice/pressreleases/stories/2010/...
Jeremy Paxman: "Do you fear death?"
Christopher Hitchens: "No. I'm not afraid of being dead, that's to say there's nothing to be afraid of. I won't know I'm dead, would be my strong conviction. And if I find that I'm alive in any way at all, well that'll be a pleasant surprise. I quite like surprises. But I strongly take leave to doubt it.