I was just looking at some vids on Youtube and you know how related videos tend to drag you away from the main video you just watched. Well eventually I was taken to videos of Banjo Kazooie. A classic game for those who know and I remembered the secret eggs and the ice key that did nothing in the first game. Supposedly Rare was going to use a feature on the N64 that would store the memory of the eggs and key you collected for 30 seconds after you turn the game off. You would have to quickly change the game to Banjo-Tooie and the big secrets would be revealed. Turns out that was scrapped but the secrets were left in. There is ths big debate about what the big reward was and after looking around it turns out a Banjo-Kazooie 3 is being made
http://en.wikipedia.org/wiki/Banjo-Kazooie_3And at the bottom they say they will reveal what the secret was.
Oh and heh at this:
http://uk.youtube.com/watch?v=rpPnK2Bl0Pk&mode=related&search=