Uh... okay. In the book he certainly isn't, and in the original cut of the movie he certainly isn't, the director's cut hints at it because it was an interesting questioned posed in the book, but it was really a dumb idea to suggest it in the movie. If he is suppose to be a replicant, he is a damn pathetic one.
"THE ANSWER IS 42"
I wouldn't consider this a spoiler. The answer is there all along really. The ture spoiler would be if you told us the question. Unfortunately this is something we are all destined to die without ever even coming close to finding out.
"GANDALF DIES(AND IS REBORN)"
Not sure if reborn is the right word to use here.
"SPOCK DIES"
You forgot to mention that he was reborn. Also you could have added that Data dies, but that movie kind of sucked.
"DUMBLEDORE DIES(SNAPE KILLS HIM)"
Damn. Now that is a spoiler. Now ten years from now when they finally make the 6th movie, I am not going to get the shock of my life when Dumbledore tells Snape to kill him so that the followers of he who shall not be named will believe Snape is really one of them. That will suck. I think.
Oh, and you forgot to mention
THEY WERE ALL LIVING IN MODERN TIMES BUT IN A WILD LIFE PRESERVE TO ESCAPE FROM SOCIETY
Oh and
"WANDER DIES AND IS REBORN FUSED WITH THE DORMIN"
What the hell? I don't watch near enough TV.
Oh, oh, one more!
'TO SERVE MEN' WAS NOT AN OATH, IT WAS A COOKBOOK