1) about 12 weeks. Of course, I didn't start from scratch. I already had my own engine (using DX9) and a 3D procedural spaceship generator.
2) every 1-2 months sounds right, but I don't want to commit to a more rigid schedule than that. I just released V1.1, about 4 weeks after the initial V1.0 release.
3) No. I have plenty of my own ideas, but Artemis is a fundamentally social game on any level. Artemis V1.0 was the answer to the question "What if I actually programmed that idea I had 25 years ago?" There's still no back story, no canon, and no vision (other than a star trek bridge). I'm not the kind of game designer that starts with an elaborate back story.
SpaceSimCentral looks like a great website, but it IS your place to mention the products you like there. If I tried to tell people about Artemis, I'd be booted as a spammer (most forums are REALLY uptight about that sort of thing these days). Seriously, if you like Artemis, the best thing you can do to help the community grow is to talk about it on gaming forums.
Creator of Artemis