Amazon has started sending out mass emails to people who still have not received their limited editions and to compensate received a $10.00 promotional credit. Not good enough!
There isn't too much difference between the two just mostly a cover change. I did order a standard green edition too and that says it will take a week, with standard shipping.
It's not well known, particularly since in both the N64 & 3ds Version the lavafall conceils it well and since it only leads to a recovery heart, Though it has the possiblity of being a leftover of the beta content, or not.
This has been known for a few years now, but if you want something else that isn't well known then check out the north end of the sliding block room in Ice Cavern. About where the Silver Rupee encased in Red Ice is you will see the cave curves past it and end abruptly. It is quite suspiscious...