IA is releasing Space Quest II on schedule, and a King's Quest game, as KQIX-Team said.
And as for AGD-I:
Once we have finished tying up all the loose ends with our current project, we will not be remaking any more Sierra games. Unfortunately, the time required to create games as detailed and complex as these is no longer something that we have the resources or time to do pro-bono. Making these games requires an immense amount of dedication, willpower, commitment, and a great number of personal sacrifices. And while we have learned many valuable things from remaking these titles over the years, the situation has certainly taken its toll on us.
Seems less like legal worries and more like lack of resources and no longer being worth it.
But anyway, back on topic: KQ9 looks so far to be truer to the classic VGA style, which I absolutely love.
Are you looking into voice acting in the near future? AGDI and IA both managed to get Josh Mandel to voice Graham in their KQ remakes. It might have been for free, I'm not sure.