Slash Films has a post up based on their interviews with Chad Stahelski and Derek Kolstad during the press junket. The following was said when the topic of a prequel came up:
Well, we’re not doing a prequel [with Chapter 2]. We wanted to, it just didn’t fit quite where we’re at….We basically almost have a prequel written, but we’d save that for other aspects of the property. Lionsgate is very interested in doing a John Wick TV show, and that seems very appealing to us, to give those creative ideas to that entity, because I think in TV you could really expand on what that is, and greater than we could in just a two-hour film. We’d like to wrap-up the story we’re telling now and maybe save all our prequel ideas and impossible task ideas for that medium.