I agree it is just a Tamagotchi V3 painted gold. There aren't even any new features.
~ Dolores ~
It IS simply a V3 with gold livalry, but this adds value. If an item is sold in a certain livalry but with limited numbers, it becomes much more valuable than a regular one with standard release colors. But not because of the color itself; but mainly because of its production and limits.
Here's an example: lets say a toy company produces toys of a train. One day they say they're producing 2,000 golden trains and they'll never be made again. The limit adds value, despite there being a minor change. You could buy a normal train and paint it gold, but it wouldn't be officialy counted as one of the 2,000. It would not hold the same value.
This rule goes for factorial production goofs as well: if a Tamagotchi is upside-down in a sealed package, or a wooden talking train in its box has a different character's face, the mistake increases value because something like that might not/will not happen again. The same rule applies for standard colors and designs that are difficult to find.
This is pretty much why the 1996-98 Tamagotchis on eBay are more expensive than current Tamagotchis. They gained value over years because production of those types of Tamagotchis have stopped, making them more difficult to find. The same thing will eventually happen to all the Limited Edition Tamagotchis and, following after, all the modern Tamagotchis.
Now, back on topic: I really want one. I hope people who won one are going to start selling them on eBay.
Imagine how expensive they'll be though--I'm guessing $40 U.S. each? And besides, most of the winners are probably in the 4-12 age range, they won't sell them...they'll tear open the cases and use them (value decreasing, as it's not in original packaging and used).
Only die-hard fans will keep them in their original packaging and save them and sell them when they're going for thousands.