No, the letters aren’t ready to read yet, but I do have something that you can look at: the complete data visualization of the letters sent during the game. Well, almost complete: if a letter was mistakenly not sent to the moderator, and was forwarded later, it usually doesn’t show up in this. Out of character messages are also not displayed.
The visualization is interactive. Click on the names of the characters to toggle displaying them–I suggest turning the moderator off if you just want to see communications between the players. Drag the handles on the timeline to filter by day. Hovering over things will usually display more information.
(The code for this is at https://github.com/ikarth/arktikos)