The stream mentioned in Dev Diary 11 can be found on Twitch (I will post an update if they upload it on Youtube). Another shorter video related to the same subject has been released by THQ Nordic:

Expeditions: Rome - The Voices of Rome

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Learn more about the Voices of Rome as Lara Sawalha (Cleopatra) and Stephane Cornicard (Syneros) talk about their experience working on Expeditions: Rome together wit Logic Artists.

Make sure to keep an eye on social channels as they will make a "very exciting announcement" on the 7th.