... Seven of Nine as a VOY-character is confirmed
... they take up with the idea of a 'darker' or 'not-so-utopian' federation, that was mostly established in DS9
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But I also say: Beside the case, they let Picard meet O'Brien (or Worf), it shouldn't be such a... well I don't know, how to describe it, but it shouldn't be such a 'big deal'. I don't want to see or hear something like "Oh, wow, Dr. Bashier, you're here... how long has it been?". They should just use a DS9 character in a way, they would choose another character. So, instead of a new or nameless captain on a ship, they could use Ezri. Or, instead of a nameless crowd in the background, they could put Morn on a chair and that's it.