Not sure about the idea to develop the metaplot in Missions adventures. I understand the idea to give them more importance, but dunno if many players outside the forums and cons will notice them at all.
Missions are part of the ebooks line. There's no reason for them to be considered any less important to the Shadowrun line than any other ebook or published adventure. There is a perception that they are a "con thing", but we started this in Season 4 fairly successfully, I think with the plot lines we ran there, and we plan to continue to do so in Season 5.
It likely won't be major, world changing stuff. We're not going to start wars between countries or have immortal elves invading great dragons. But it will effect the setting in some way it can have lasting repercussions. We managed to turn Seattle upside down, and Chicago is a lot more open.

Because the new edition was not about fixing things. It was about making things different.
Yeah... no. Not at all. The new edition is about fixing things. Some things didn't need fixed and were left alone. Some things are just tweaked ever so slightly to fix wording or play style issues. And some stuff it was felt would work better if it was changed in some way, large or small.
Bull