A draw really looks like the least likely outcome in this match (although I wouldn't be surprised if I saw a 3-3 draw):
3,75 - 4,40 - 1,83
In my opinion, bookmakers overestimate Bayern too much, this season we have already seen how it can unexpectedly lose (including to Borussia), so I would estimate Borussia's odds much higher than bookmakers say.
Considering these odds, the probability of winning for any side is higher than a draw. But just as you indicated, I also wouldn't be surprised to see a draw including goals. Both teams are very capable of scoring when we think of their attacking lines. And in their previous games, we saw how easy both teams were scoring. But the odd of the 'both teams to score' option would be quite low I guess.