Hi Andy,
Outerra is primarily an engine, developed to be usable for simulators and large scale games. Because of the procedural approach combined with real data, lots of stuff has to be implemented and optimized for it specifically. The progress may feel slow because of that, and because we are just a small company with limited resources for now.
Anteworld is a technology demo based on the Outerra engine, a demo game that's giving people an early access to the developed tech. People who like OT and want to support our development can upgrade from the demo and get the alpha access. Anteworld is at the moment little more than a sandbox environment, but it will grow into a normal game in the future, and it will probably also lay down the basis of a combined simulation/game platform.
It serves as a test game through which the necessary engine functionality is developed and tested, before the engine itself can be made available generally. Currently the engine is being licensed only for some special simulation projects that can handle its alpha state and are compatible with our development path.
Release dates for engine or the game aren't determined yet, as it depends on too many factors and many apps can be developed or started to be developed before the engine is deemed officially released too.