Based on this picture, it looks like there will be a fire control window (on the right), which in theory should be able to handle whatever range.
This image shows a wave of incoming missiles, denoted by the little red dots.
I think the images we've seen are test shots meant to look pretty rather than reflect what combat turns out like in a real game.
edit: Either that, or the stock weapons are limited in ways that mean combat at tens of kilometers is optimal.