It has been announced that Pokémon Crystal is coming to the 3DS Virtual Console via the eShop early next year.
The game will come to the eShop on the 26th of January 2018 and to celebrate the news Nintendo have released an official trailer for the game, which can be seen above. It has also been revealed that players will have access to the GS Ball in this version of the game, which means you'll have the ability to capture Celebi in-game.
It has also been revealed by Nintendo of Europe that a special Pikachu themed New 2DS-XL console will also be released on the 26th of January. There is currently no word of the console heading to America.