Ironhide Game Studio released a new teaser trailer for Kingdom Rush and Kingdom Rush Frontiers. The video shows the new endless challenge modes coming to both games. The Frontiers' level seems to have an Egyptian theme. You can see the bottom of a pyramid and Anubis-like bosses in some of the gameplay clips. It is also nice to know that Ironhide Game Studio took the time to add new enemies instead of just recycling the old ones. This is what makes Kingdom Rush and Frontiers two of the best tower defense games ever released.
It is still unknown if this will be the last update for the franchise. Developers typically only release an endless mode when they are finished with a game. This isn't necessarily a bad thing because the ending of Frontiers does hint at a possible third game. It is also hard to imagine that Ironhide will abandoned the popular franchise since they have been adding fresh content since Kingdom Rush was originally released in 2011.