You have the ability to pause, slow down, or speed up the game. There is also a progress meter, which will display how much time has elapsed, and where you are in time, in the replay. At this point, there is no rewind option, but this may change in the public release. Replay files are very small. It appears as though they will depend more on the map being played rather than the length of the game itself.
Players also have absolute control over the replays themselves.
You may also choose to see only the units and buildings of specific players involved. Past this, you may scroll to any area of the map you like, and select any unit on the map. This is useful for checking health of mana when a conflict is on the horizon. Now that we understand exactly how this will work, let's take a look at what this new feature is going to do to the game. With the new .rep files being so small, it will be as easy to pass them around as it is to pass around scums that are created every day.