How will Season 3 end ??

Well we finally know what Kynes has been up to. From the preview, it looks like part of his plan is to make contact with the Raps' enemy - and presumably coordinate with them, if they're open to it. What they have to say is going to be huge! Whether they're allies or tell Kynes that humanity helped the Raps, voluntarily or not, so we can burn with them, will lead the show down very different paths.

Colony has really hit its stride in the second half of season 3. I hope we get to see how things play out in a fourth season. As of now, no decision has been made although the ratings are comfortably in the range of other USA shows that have been renewed.