I think the most important lesson we've learned is that a significant portion of the really good players were very cagey about even revealing the pieces they thought would be competitive.
I follow X wing pretty close and like half of the top 16 had elements I would have raised an eyebrow at if someone brought them to casual play.
Which is why it's important to not listen to what the podcasts are saying about the meta. These are all players first and foremost. They'e not going to talk about what they think will actually win or the lists they think will be top contenders because they don't want people preparing for them. Especially NOVA.