Palpatine’s speech in the trailer sounds like its taken directly from ROTS so it’ll be interesting to see if that’s his only appearance in this series or if McDiarmid will reprise his role like he did in Rebels.
And speaking of voices, in addition to weather or not Fennec will be an ally or antagonist to the Bad Batch, I’m assuming they’ve gotten Ming-Na Wen to voice the character. Since this is a younger version they could justify another voice actress, but since she’s already on The Mandalorian I can’t imagine it’d be hard to get her to voice acting for the character as well.