I found some places for public viewing, if you are interested in charing the game with some other People, not just sitting at home by yourself ;-)
- Cinemaxx am Raschplatz has opened one Cinema to show the game for free, tickets can be obtained only on the day (5 tickets max.! per person) maybe call them in advance to know about the exact time etc.
- of course there is the famous Sportsbar "Nordkurve" near the AWD-Arena (Stadion) where it will be packed with soccerfans
- in the bar "Mephisto" at the Faust-Gelände in Linden there will be offered a Schnaps for every goal in the colours of the team. They planned to do an outside viewing but because of the cold weather it's going to be inside.
there might be other places too, I haven't found out yet ... have fun ;-)