When it comes to Newcastle there is a big potential in them to finish their group stage even as leader. Because we must have all watched how they demolished PSG not much time ago.

Despite Milan's high dominance in San Siro Newcastle managed to resist them and get that one point also.
Truthfully I think the matches against Dortmund will also go really well for Newcastle. I think they can get at least 4 points.
I think Newcastle will lose only once in Group F and that will be against PSG away.

At home Borrussia Dortmund have just won the game tonight, now they'll recover and go prepare for war against Newcastle United. They both look good but my verdict would be passed tommorow once Newcastle is done playing.
I'm not expecting a soft tie, a rough and hard one is mandatory, it'll be shameful to see Borrussia Dortmund leaving for Europa League.
Since Dortmund will be away, I expect them to attack vigorously. They should be the first to score a goal if they take good use of whatever chances got.
I'll be excited only of they can go top of the group, Manchester United struggling so I'll be supporting the rest of the Premier League clubs present in the Champions League.