A new patch for Assassin’s Creed: Syndicate has been released for PlayStation 4 and Xbox One, and it’s around 700-750MB in size.
Patch 1.2 includes improved performance and stability updates, fixes online issues such as the lack of rating for final mission and the Trophy/Achievement description not appearing in Canadian French.
Audio issues such as lip-sync delay in the cinematics and subtitles not matching the audio were fixed, as were collision issues for carriages and trains. The patch also fixed some spawning issues with the vehicles.
Other improvements were made to the world, 3D, menu and HUD and various issues with fights, missions, and sometimes falling under the map have also been resolved.
You can have a look at the entire set of patch notes over on the Ubisoft forums.