Well, I've put about 10 total hours into the game so far, so not very soon. But there's been lots of talk of actually doing it very recently. If I can convince my big dumb brother to make the engine into something I can actually work with... it won't take long.
I'm not going to make anything without an engine designed by superjer. The game is going to have some... unique... characteristics, and couldn't possibly be made with any generic 'game maker' type engine. SJams can make something as simple as this VERY FAST if he'll just get to it. The problem is that he's such a perfection freak with his code that it's very rare that anything ever gets to a useful state.