None yet. I am guessing they will be keeping it under wraps until Season 3. I think it's mainly a way to get us hyped for more stuff behind Agent Msika, and the general focus on what Season 3 will be on. SILVERSPEAR was a way to find one of the main enemies of the new season, and I think that we'll see way more of A.M.W.O.G. in the future, as well as a few other familiar faces from the past. It IS an epilogue, after all. Like Anashel said in the other Mother Russia thread in the Suspected Missions forum, this is basically like an extra, like when you stay after the credits for a movie and they have extra footage at the end. Like I said, my theory is basically this: Spoiler The child is either an AI or a Cyborg created by A.M.W.O.G. in The Sprawl (due to Ghost in the Shell reference in the e-mail. Also, they look to find the "Puppet Master". Funny stuff, guys!), which holds Agent Msika's consciousness in her database. She is talking from both Msika's viewpoint and her own, taking about and wondering who Gwen is, and other things she has picked up from the Agent. Judging from this, she also knows about The Black Watchmen, which is worrisome. Msika may have known the locations of other agents, and they may be in danger, as well. This is NOT good.
I got that email and worked through it myself. And yes, I identified the text as Lovecraft and further googling turned up the Dream-Quest of Unknown Kadath. Interesting about the AMWOG code, I didn't think of that. Typically, we get those as number strings than shapes, but still, interesting. I suspect we will find out more when the next season is prepared. I wonder how deep Grisha is in this as well.
A special note: Did we ever find the reference for 'Carcosa'? Because Carcosa is referenced in books that weren't written by HPL himself, but are considered a part of the Lovecraft mythos.
Erm, guys... I don't know how many of y'all listen to the in-game music, but that song in the video is a theme from the dashboard... I can see where you got Ahnayro, but listen to the in-game music more.