If you want to geek out like I did, Tyson's podcast (Star Talk) had a recent episode where he and Bill Nye were part of a panel for a Higgs boson "particle party".
With his charisma and the way he has positioned himself as a spokesman for all of science, he would be a great narrator for SSE, too.
[rant]We have the darn touchscreens in every vehicle in SSE and it is 20 freakin' 13! I don't have anything against Judy Dench, but let us pick the narrator in SSE already! There are so many awesome people you could choose from! Neil deGrasse Tyson, Patrick Stewart, Morgan Freeman, James Earl Jones! You could have special narrations based on age range! You could have the old narrations hidden as "easter eggs" for the fanboys! Make it happen, Disney![/rant]