Series 9 Episode 7 discussion

[Puppetmaster]

At the beginning of Series 9 - Peter Firth said they had written two endings (presumably dependent on whether there is to be a 10th series or not) and that he had had to go back to film the alternative ending

Series 9.8 Spoiler: show

and that he had blood on his costume. That sounds as if they might have written a conclusion to this long drawn out story of betrayal if there is to be no 10th series, but is someone going to be left dying on that rooftop if there is going to be another series.
I really hope we don't have to wait another year on the edge of our seats wondering who it will be.