IMHO, this is not THAT big of spoiler. It is an option you would get early in the game. Kinda like getting Minsc early in BGII wouldn't be that big a deal. Now if they told you about a MAJOR part of the plot of ToB like some have about BGII, then it would be a big deal. Just my two cents.
Later
BK
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The Black Storm Cloud of the Night
Consort to a Queen
Champion of Truth, Justice and Cloudy's Way
Captain of the Knights of the Golden Dragons
Heart, Mind, and Soul
Offical Wizard and Warrior Questioner