It will be a very interesting game. At least on the basis of how their first meeting ended. If you remember Dortmund led 2-0 until the 89th minute and then lost the game 3-2 in 5 minutes 
I remember this result very well because Dortmund ruined my multibet at the moment when I already saw that the game was almost over and calculated my profit, and then I saw that my multibet was destroyed. It was damn unexpected.
The upcoming week is extremely important for Dortmund and they should avoid at all cost to lose the game against Werder Bremen. They now qualified for the next round in the DFB Cup, they can extend their winning streak to 5 games in the Bundesliga and keep up pressure on Bayern Munich, and they could close perfect 7 days by winning the first leg against Chelsea in the Champions League. I remember this result very well because Dortmund ruined my multibet at the moment when I already saw that the game was almost over and calculated my profit, and then I saw that my multibet was destroyed. It was damn unexpected.
Dortmund has given it away a couple of teams in the last seasons because of their instability. I hope that they can keep winning their games and keep the Bundesliga interesting along with RB Leipzig and Union Berlin and maybe Frankfurt as well.
Now we have 20th round matches and few very interesting matches are also going to play as Werder Bremen going to host Dortmund and Leipzig going to host Union Berlin these matches are going to have big impact on league table as well because winner could be settled at high rank and this all will give some benefit to leaders Bayern Munich as well which is currently leading by one point and having easy game at home against Bochum in case of Leipzig and Dortmund win Bayern Munich will be able to have lead of three points and in case of draw between Leipzig and Union Berlin still they will be having three points lead which is good but in case of lost for the Dortmund they could be felt better.