New features. Source is Serebii.

Pokémon X & Y - Bonuses

Ahead of the opening of the new Pokémon Global Link with the launch of Pokémon X & Y, they have announced a new feature of it. In Pokémon X & Y, you can earn Poké Miles within certain parts, currently unknown. However, there is another way to earn them. It has been announced that your Dream Points will be converted to PokéMiles. The conversion is as follows:
10,000–49,999 Dream Points = 500 PokéMiles
50,000–99,999 Dream Points = 3,000 PokéMiles
100,000–199,999 Dream Points = 10,000 PokéMiles
200,000 + Dream Points = 25,000 Poké Miles
The conversion is calculated by adding the Dream Points from all the games on your account. So if you have Black, White, Black 2 & White 2, they are all factored into the calculation. They also announced special Medals that are unlocked in the Pokémon Global Link if you also had Generation V games.
A Medal for Dream Points: 50,000, 100,000 or 200,000
A Medal for amount of purchased homes: 1, 4 or 8
A Medal for purchased items: 1, 25 or 50 items purchased
A Medal for purchased Pokémon Dolls: 1, 50 or 100 dolls purchased
A Medal for ranking in the top 100 in any GBU Season (except Season 10)
A Medal based on how many times you have ranked highly in WiFi Competitions
The effects of these PokéMiles and Medals are currently unknown.