It was not obvious, given that we had no information one way or the other. People were guessing, and had a fifty-fifty chance of being right.
Now we know they're working on it. We also know that five months before release it's not in a fit state to be showcased on a demo in any form, they would prefer to use placeholder sounds. We have no idea what this new system is, what it entails or how it will sound.
At this point, they could as easily decide it's not going to be ready for release and we end up with the sounds from GT5. Kaz has been known to make wildly optimistic statements in the past. We can release any time we want? Please.