There aren't any more episodes until 6th or 7th of Feb. The are waiting for it to catch up on Sky first and then there is a break. They kept doing this last season, you'd get a few weeks of episodes and then none for a few weeks.
Check on the ABC website for Lost. It gives you episode breakdowns and that's where I read about the next one being in Feb. Just google for Lost and then go to the official ABC network link.
It's annoying isn't it? We've been downloading it too, we don't have Sky, and we NEED ANSWERS!!!!