According to Nintendo UK's page about this game, the special edition will be as follows and as usual NOE >>> NOA
While supplies last, fans will also be able to purchase a special edition of Metroid: Samus Returns which includes a physical version of the game, a download code for the original Game Boy game Metroid II: Return of Samus to be redeemed in Nintendo eShop, a SteelBook, a sound-selection CD featuring 25 tracks from across the Metroid franchise, a gold S pin badge, a Morph Ball 3D keyring and a 40-page artbook.
I cannot find any preorders yet...
https://www.nintendo.co.uk/Games/Nintendo-3DS/Metroid-Samus-Returns-1234232.html
So...they're not including the original Metroid as an in-game bonus a la Zero Mission, from the sounds of it.
Remember when Nintendo used to include their older games a bonus?