The Independent has posted their phone interview with Chad Stahelski that they did for the Blu-ray release. It’s a good read on how they developed John Wick from the beginning. Some details on John Wick 3 are below:
What elements that have been unexplored by the series so far do you hope to explore?
We are going to put in something about the High Table, how that all works. We’re going to put in something about where John comes from, and where he wants to go. I don’t want to say too much more, but it will be a nice completion to Mr Wick’s journey.
Do you think this will finish a trilogy, then?
In our minds, yes. But I’ll let the studio answer those sort of questions.