Konami has shared some more details on the DLC and pre-order bonuses for Metal Gear Solid V: Ground Zeroes. As announced earlier, early buyers of the game will receive downloadable content that gives them an advantage if The Phantom Pain. This goes for European copies as well.
From Konami UK:
The pre-order DLC codes will be provided via a printed insert within physical copies of GROUND ZEROES. Digital versions will access the pre-order DLC automatically upon loading THE PHANTOM PAIN. Once the DLC content is unlocked, users will have access to exclusive Mother Base items that will give GROUND ZEROES users a key advantage when they embark on THE PHANTOM PAIN.
Although details on THE PHANTOM PAIN’s scenario are as-yet unrevealed, any characters or POWs rescued within GROUND ZEROES will be available within THE PHANTOM PAIN. Similarly, players will be able to use their save game from GROUND ZEROES to help establish a Mother Base in THE PHANTOM PAIN, while actions made when rescuing hostages, POWs, and specific characters will all have important repercussions later on. More details to come!
Furthermore, those who pre-order the digital version on PlayStation 3 via the PSN Store receive a free (digital) copy of Metal Gear Solid: Peace Walker HD Edition. Good news for those who missed out on the game, since Ground Zeroes is a direct sequel. At this point it’s not really clear if this offer is valid in all regions or not.
Source: Konami UK, Metal Gear Solid Official Facebook