For what i know, a sequel whit the defeat of Tyrannus was planned. I like to imagine the Sleg army was splited in two ( remember some forces dont like to be leading by a human ), and that case and the apearence of "new friends" forces helping the other humans armies help to defeat Tyrannus one for all. After the Slegs was defeated in the defence of the leader stronghold , this "new friends" reveal their true colors and was the Campaigner army, all the human forces and reptils are to weak know after a long war and cant hold the conquest of Campaigner.
The Universe... IS MINEEEEEEE and the game ends.

It shouldn't come off as much of a spoiler with the ending of evolution. Bruckner dies and Tal set takes up the Tuork title. But it has driven many fans including myself what exactly happens to the failed and obviously frustrated lord tyrannus as well as Tarkeen. Now this is gonna be a pretty loosely based and somewhat generic theory but I personally believe that after the fall of lord tyrannus, the river village had lived in peace under Tarkeen's rule, him deciding to stay now that the threat was wiped out, and Tal Set returning to his own time. That is until a new threat had invaded: The Campaigner. With the discovery of this new land, he invaded, taking no mercy on anyone. Slaughtering the defeated Lord tyrannus, he would move on to the river village, and work his way through newly built civilizations, being the ruins and treetop village, leaving nothing but a blood trail. With Tarkeen on his last leg, I think he used what was left of his power to once again summon Tal Set, the proven warrior to not only save earth and the lost lands from further dominantion, but to also avenge the village and lives he had saved a few years before all of this. Now this is purely speculation and my own theory. What about you guys?