Blizzard has never released an actual image of the skill trees to be included in Diablo 3, but fans have taken it up themselves to construct them from data that is currently available.
The following Diablo 3 Skill Trees are based on the skills, requisitions, and positions of the Blizzcon 2009 demo build.
Note: the following images where taken from random sources on the net since the original creator seems to have taken them down. Credits go to the guys at IncGamers for producing these representations.
There is no entry for the Demon Hunter class in our Diablo 3 Skill Trees list because it had not yet been announced at Blizzcon 2009.
For full details regarding all the skills from all the classes, check out these pages:
You can also check out the official Blizzard Diablo 3 build generator.