This is now available! You can sync Playlist playback, even between different Playlists and different Players! As long as the duration is (almost) the same and at least one Image is included in each synced Playlist, then playback will be synced perfectly – especially useful for digital menu-boards, take-over videos, or other screens mounted side-by-side.

You can find more information here: https://www.yodeck.com/docs/display/YO/6.+Playlists#id-6.Playlists-SyncedPlayback