As you have guested we still didn't firmly decided on what exactly we will put in the final engine.
So far the general concensus is that we make it object oriented and of modular design.
We don't plan of focusing the game engine to specific game genre in the first place. But modular design should alow you to quickly focus the engine to desired game genre by including or excluding certain features.
Modular design will also alow you to extend the engine with your own code if needed.
We are leaving an option for making specific editor but at first we want to focus on the engine itself.
What is our wish for final product? We want this game engine is to be able to compare with other comercial game engines out there like Unity.
But my personal wish is that we make this engine even better than Unity

Anywhay we are currently in making of a basic design document for the engine.
Naturally as soon as more firm decisions are made we will notify the comunity about this since this is a comunity based project after all.