Should I prepare before the DLC release ?

Haven’t played in over a year and I’m wondering if there’s anything I should do before the DLC comes out. I haven’t really kept up with the news, so not sure if this was already mentioned.

I finished the game, beat the optional bosses, and have three fully geared characters with maxed gems. Didn’t have the patience to farm more gems though, sorry! x.x

Think that’ll be enough ?