At D11, when Walt Mossberg came after Tim Cook on the issue of openness, and how Apple wouldn't open their Home screen to Facebook's Chat Heads, and how their keyboard had fallen behind Android third party solutions (like Swype or Swiftkey), Tim Cook responded that Apple would open things up in the future.
Not wide enough for Chat Heads to get in, of course, but wider than what the current iOS SDK allows, and something third parties could do... something with.
Since resounding market success has thus far eluded Facebook Home, none of that is surprising. It's always been a solution in search of a problem. However, the idea of deeper third party access is certainly interesting.
But can anyone seriously see a near-term future where Swype would be allowed to replace the default iOS keyboard?