Originally Posted by
Andyssian
To people who don't know how the story from the games - the movie is based on the First War, which ended with Stormwind (both the city and the kingdom) destroyed by the orcs and the survivors, including Lothar, escaping north to Lordaeron by ships. Later on Orgim becomes the Warchief of the Horde the orcs attack Lordaeron. This leads to the Second War (likely to be a storyline that's planned for a sequel), where ultimately the Alliance pushes back the Horde and in the final battle Lothar and Orgim face off against each other.
The more I think about it, the more I hope they don't retcon the First War's ending just to avoid people getting pissed at humanity losing and feeling the movie was cut in half because of it.