In an interesting turn of events, Bethesda seemingly thought it would use Fallout Shelter to promote the upcoming Fallout 4, but the former has already done very well for itself. Either way though you’re getting a hefty amount of cross-promotion, as Preston Garvey of the Commonwealth Minutemen, an upcoming Fallout 4 character, is making his way into Shelter.
As of today you’ll be able to find him in lunchboxes, which can either be purchased for real money or earned in-game. It’s a small little thing but I like the idea.
Fallout Shelter: A Legendary Dweller from the Commonwealth [Bethesda Blog]