This has been beaten to death in some older threads on this forum, somewhere in the AI War forum. At any rate: no, there are no plans to ever make AI War more than single-threaded for the main thread, as that's basically technically impossible because of the required network model.
In terms of the AI thread, using more threads would be worse than useless, because it doesn't need to run any faster and so that would just be a waste of your RAM and extra cores.
The AI thread is already faster than the network can handle, so it has to be throttled to only so many commands per second to avoid flooding the network with too much data (and in the case of single player, it gives the AI at least a slightly more human-like reaction time, and keeps the reaction time of the AI from varying too much by host.
In terms of Tidalis: that's ridiculously lightweight already, and there's no point.
In terms of AVWW: that's somewhere in between AI War and Tidalis in terms of load, but it's still not likely to require multiple threads or even benefit much from them. It won't have a separate AI thread, so, like Tidalis its game logic will be purely single-threaded. (Things like networking, sound, music, and so forth do have their own threads in all these games, but the load there is so trivial that they don't even really register on the other cores compared to the main game thread).
The network model of AVWW doesn't present any technical barriers to multithreading (unlike AI War or other strategy games), though. So if we wound up needing to have worker threads for long-running processes, those could be set up for AVWW. I just strongly doubt that will ever be needed, given the game design. After AI War, we're used to writing such highly efficient code that it's likely to run on one core, anyway. And it's a catch 22, because any computer with a weak enough processor to need more than one core... probably only has one core anyway.
So, no, there are no plans for this for AVWW unless it becomes down the line, and it's completely out of the question for AI War for reasons that have been discussed in extreme length and detail (that was a massive
forum thread last year, and nothing's changed since then) before.