Jurgen Klinnsmann returns to football to manage champions Hoffenheim . Werder Bremen , Bayern Munich , Wolfsburg likely to challenge Bayern the season . Legendary keeper Oliver Kahn retires , while Jens Lehmann back with Stuttgart . Moenchengladbach , Oliver Kahn back in top flight ; Schalke new to Bundesliga .
Jurgen Klinnsmann returns to football to manage champions Bayern Munich . Werder Bremen , Schalke , Wolfsburg likely to challenge Bayern this season . Legendary keeper Oliver Kahn retires , while Jens Lehmann back with Stuttgart . Moenchengladbach , Cologne back in top flight ; Hoffenheim new to Bundesliga .