Yeah, he mentions that here @ 2m20s
https://youtu.be/OXpx2C6rFAc?t=2m20s Says roughly 'Squadron 42 is going to be split into a trilogy, Episode 1 has the equivalent of 70 wing commander missions"
Though I honestly don't know what the hell he's saying in here.
He says there's 21 chapters, each a segment of missions, but he seems to consider each "mission" just having a check point. So it would have 21 missions with 3 segments? Who knows.
But they're also talking about ground missions ala Mass Effect which seems a bit odd because wasn't Star Marine on indefinate hiatus? And isn't the engine for that required for these ground missions?
The CitizenCon address also added something new though. It says there will be "sandboxy areas" with "optional side missions".
So, as I understand it at the moment. RSI is making four games. Star Citizen, and Squadron 42 Episodes 1 with two sequels planned, each with 21 segmented missions, equivalent of "70 WC style missions" including space and ground combat plus sandboxy areas with optional side missions which may or may not factor in the 0 mission count.
All of them "next-gen AAA quality".
Good luck I say