I think the big problem there is: you can only do so much when you have no fixed plans yourself. It's entirely possible that Firaxis itself isn't quite sure whether it can commit to an expansion yet (as Firaxis probably has another two or three big projects running in the background). Furthermore, Firaxis was never great at communicating, they are very much a traditional games company, they are just slowly embracing the whole social media side now, so it's unsurprising that they are careful (esp. regarding future plans, as this would need extra vetting by 2K as well). On top of that, they are working on a patch but still testing it, so that points towards them still tweaking the balance... but that might or might not work that well. And, finally, modders are probably waiting for the DLL as well, which also consumes resources to sanitise and prepare for general consumption. Nevertheless, it'd be nice, if they tried to communicate more - that's just something a lot of communities appreciate more than in the past, especially of there are issues like Civ:BE's somewhat mixed reception from reviewers.