First, this is the wrong forum. The Blue Planet forum is here: http://www.hard-light.net/forums/index.php?board=169.0
Second, you did nothing wrong. After the Renjian gets destroyed, Admiral Bei departs and the Protagonist has had his little discussion with his wingmates, you need to jump out. That is what "Defect to Earth" means. And since it is the last mission of the campaign, there is nothing else to be done.
Third, the Solaris and Battle for Neptune videos are previews for the second part of Blue Planet, which is still in development.
Fourth, Blue Planet: Age of Aquarius will be rereleased soon, with a few bugfixes, graphical improvements, and most importantly, voice acting.