Edit 2: Merkel won by landslide. Her speech:
"Heute wird gefeiert - morgen wird gearbeitet." (Today we celebrate, tomorrow we work).
Edit: Merkel set to win - http://www.spiegel.de/international/germany/merkel-wins-third-term-in-general-election-exit-polls-suggest-a-923755.html
Background reading/in-depth articles.Live blogs (in English):
Infographic - http://wahl.tagesschau.de/wahlen/2013-09-22-BT-DE/wahlmonitor/index.shtml (in German but you'll be able to figure it out anyway.