| Apparently the information was retrieved from data mining the alpha client. The client download was linked also if anyone wanted to verify the data mining (of course this doesnt discount the posibility that the client was edited with fake data insterted into in it).
The abilities listed may appear in the client data despite never having a chance of appearing in game. If you want to be really cynical its possible blizzard put fake data in there to discredit anyone datamining the client.
Another thing to note is that the page is essentially a wiki. Which means people can edit false information in at any point on the page. That being said the "recent changes" tab seems to show heavy moderation stopping people trying to corrupt the article with their own ideas for skills/talents (most notable being any rogue spells/skills which have been said are not implemented in the current build). | 