Edit: Guess the point is, even if it is really good, I'm not sure it could live up to expectations.
Oh, it's almost guaranteed not to. But who cares? Even if it's only half as good as the book, it'll be a great movie, particularly when you compare it to the bilge that permeates cinemas these days.
This hack does not deserve to make Neuromancer.
And it was the guys first movie, on a tiny budget.
I haven't seen Splice yet, but have heard mostly good things about it. So don't write off the guy just because of Cube.
Gibson's writing is good because he develops incredibly complex social systems and structures for the reader to navigate. He does this mainly by leaving gaps in the world that the reader has to imagine or guess at. Some of them are filled in, as the plot progresses some of them are filled in and explained. This is incredibly difficult to do well in film. Directors are always tempted to show everything and producers demand it if there is the budget for it. The world becomes simpler, flatter, maybe a little silly.
Stylistically, I think it was dead on.
EDIT: goes over the differences between the international version and the Japanese version: http://www.movie-censorship.com/report.php?ID=1523&In=Qu... basically, they removed nearly every supporting scene for the main Japanese character, and the explanation of the ending.