I just want to let the community know I haven't abandoned Open-IG, but I don't have the time nor the mood to work on it right now.
I myself feel how cool certain features, such multiplayer, would improve the game experience, but unfortunately, my daily job is draining all my energy right now.
The problem with other issues, like the AI or ground pathfinding, is that I don't have the slightest idea how to make them better. Such qualities of other games are trade secret and can't be found on programming blogs or even paid-for books.
Therefore, If there are enthusiasts out there who can program Java and willing to contribute, now would be a good time to join the project.