I thought the same about Leicester last year, than they would drop on next matches and one of the bigger teams will won, but sometimes a non favorite team has luck and finish winning the championship.
It wouldn't be the first time that a new league team wins the champions title in the first year. In 1997, FC Kaiserslautern won the championsship after they played in the second league the year before. So Leipzig could repeat this success. I personally think that the team is too young (it is the youngest of all Bundesliga teams) to have the experience to win the season.