My suspicion is that Sins will be shelved for a while and that Ironclad will work on a land-based 4x-RTS
I can just imagine a Total War style world map where you could zoom in to battlefield level. You'd have territories instead of gravity wells, towns and villages instead of extractors, and big castle cities instead of planets. That would be quite awesome.
Unfortunately, it's all conjecture. Given IC's track record so far, though, I think we'll be happy with whatever is upcoming.