Why relegate the UEFA to expansion pack status? Mostly because FIFA 12 has been so popular, EA communications manager Steve Frost told Gamasutra. "We felt this was the best way to extend that experience and deliver fresh new content to our fans," he said. Releasing UEFA as DLC helps keep players engaged in FIFA longer.
"We expect that some fans who may not have FIFA 12 will want to play Euro 2012 and therefore purchase both," he said later in the interview, "but the bigger opportunity for us is to offer our loyal and passionate FIFA fans new content." Chances are, if you like soccer, you'd be interested in FIFA anyway, so this seems like a win-win.