The Hitman website has "important release news" for Hitman, saying is delayed and that the next installment in IO's assassination series is now expected in March 2016 (thanks MCV). Here's word on the setback, which they somehow manage to relate to the fact that the game will not be complete upon release, though they are adding more content as part of the process:

It’s safe to say HITMAN is the biggest venture we’ve ever undertaken at Io-Interactive. Not just in terms of scope and ambition but also in terms of the size of the game world itself. The playable area and density of our locations goes beyond anything we’ve built before. We’re striving to create a series of living, breathing worlds in those locations and we get pretty obsessed about every detail that you’ll experience.

On top of that, we’re going for a new release model where we put out a good chunk of the game when it begins and then release the remaining locations over time. We want to make absolutely sure you all get the best possible experience when you join, so we’ve made the difficult decision to move the initial release date to March 2016. These few extra months will mean we can add more to the launch content of the game, more than we had originally planned, and then follow with a tighter frequency of updates, which ultimately will create a better game for everyone. And in the end, that’s what we’re all looking for.