This, there was a live letter about 2.1 less than a week before 2.1
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Yeah the March 22nd Letter is part 2 of 2, with the patch notes likely being posted immediately after the letter and the patch itself within the next couple of days.
As for new raids, I'd certainly like a little more variety in that department, especially since their current plan seems to be having a single max level raid and (half of the time) having a much easier one 10 (or so) levels below the max. It would probably throw off their desired pacing by a lot, so I wouldn't expect it until / unless they want to modify itemization a bit (sidegrades) or they want people gearing up twice as fast for one reason or another.
Ha I forgot about that first half of the letter, it was the pretty short one where the second part of it was a get to know the team member thing, hopefully they are holding back some secret content that they will surprise us with instead of just the topics they have listed.
Sadly, that's not possible either - as Minfilia stated that Gaius had recovered it from beneath Ala Mhigo, which still isn't accessible to this day. I love the Praetorium ruins dungeon idea though - maybe have the player competing against a Garlean reconnaissance team sent to recover any data concerning Nero's experiments, maybe even have him show up there for a rematch. ;)