You will now be able to save a replay during any point of a singleplayer scenario - or at the end of a multiplayer battle. These files will then be available in the load/save panel, using the new "Replays" button to toggle between saved games and replays.

Similar to the controls in multiplayer turn replays, you'll be able to watch through the entire game.

Controls include disabling fog of war as well as switching to the perspective of any other player by selecting their nation in the resources popup display (above the minimap).

You will also be able to take over control at any point during the replay and continue playing it as if it were a normal savegame or scenario.
This feature should be great to create AARs, share tactics with other players as well as debugging and balancing purposes for us, the developers.