'Pokemon Gray' domain registered by Nintendo! Er... 3 years ago!

Having said that, it's possible that the domain was registered by someone else initially, then taken over by Nintendo - still, the latest it could have been under Nintendo's control is the last registration date - September 11th, 2010. (Incidentally, PokemonBlackWhite.com was first registered on January 1st, 2010, about three months before the games' names were even announced in Japan.)

What has also failed to be reported is that Nintendo/Melbourne IT own literally thousands of domain names, plenty of which relate to Pokemon. They include PokemonBrown.com, PokemonOpal.com, PokemonTopaz.com, PokemonAmethyst.com and PokemonCrimson.com and trademarks for most of those names.

So whichever way you look at it, this is not news. The existence of a domain name or trademark is no proof that a Pokemon game of said name will be released. Many companies regularly register speculative domains to protect their brand from domain squatters and the like. The next Pokemon game may very well be Pokemon Gray but equally Nintendo may decide the name sounds too dull and plump for something like Pokemon Rainbow (which by the way is not registered).