Well, games have to make money right? Seems they're following the footsteps left behind from Mass Effect and FIFA, and integrating a micro-transaction feature in Ryse. You are able to buy different packs; Bronze, Silver, and Gold packs from either gold earned by playing multiplayer games, or from real life currency. I think this is a decent feature, not too game-breaking and doesn't give much of an advantage.
Via OXM
"Those booster packs contain random sets of loot. Based on the different tiers of loot that you get - whether you buy Bronze, Silver or Gold Packs - guarantees whether you get rare or common items.
Via OXM