Neither season 2 nor season 3 have been confirmed. Despite the breathless reporting of the game media that a second season has been "officially confirmed", this is false. It hasn't been. It has become an open secret that IOI is working on it, but there have been no official announcements, no press releases, and there has been no confirmation through official channels... there's been total radio silence outside of a few dev comments in a French interview from half a year ago. Everyone is staying completely mum.
I still think it's much more likely to happen than not, but it's still possible that SE is doing more forecasting and could pull the plug on a second season, which is why there's been no official word. (Cancelling an announced game tanks a public stock more than quietly shelving an unannounced game.) IOI is definitely working on season 2 right now, but please realize that they would be doing this whether or not SE greenlights a season 2. SE and IOI can't wait for sales data in order to begin development on season 2, so they would fold the cost of initial development of season 2 into season 1, and then hope that the next season would be OKed by higher-ups in order to get enough money to complete it.
I don't mean to be a bummer. I still think we're probably getting a second season. But seeing this thread titled 'Season 2 Officially Confirmed' keep floating to the top of Hitmanforum is spreading a lot of misinformation. There are a lot of times where game development begins on a sequel, but then it gets scrapped because sales of the original weren't good enough. The fact that the second season has not been confirmed is worrisome.