From what I understand from people I've talked to, the new fireworks show is ready - it all depends on when they wanna move forward with it. With as much is happening with Entertainment this year (between the new castle show, new Star Wars offerings at Studios, Rivers of Light, etc.), it may be a little while. On top of that, an October opening date may not be seen as a great idea (even if it is the 45th) because of seasonal offerings happening every other night or so - non-party nights at Magic Kingdom are already packed, it would only make it worse if they were to bring in new Entertainment on top of it. We may see something within the year, but who knows really? (New parade may or may not be coming within the year too - I've heard accounts of float testing)