There are only 2 times I can recall reading a forum post that claimed to have secret information about Nintendo that turned out to be true and in both cases the claims seemed so insane that they were immediately disregarded by most people:
The first one was someone who claimed to be the son of a person who was high-up at NOA; his claim was that The Legend of Zelda on the Gamecube was cell shaded, had a similar look to a link to the past, and sailing was the main form of transportation.
The other one was someone who claimed that Nintendo had created a motion sensitive one handed remote which also acted like a pointer on the screen.
In both cases it is possible that these people actually had insider information (after all there are thousands of people who would have know about these things ahead of time) but you also have to consider that a broken clock is correct twice every day.
