I don't see anywhere in there that things aren't able to be implementing because the hardware got better. If I remember correctly, Nomura's original idea was actually too ambitious for the PS3, which was part of why it moved to the PS4. I take him saying that they had to reevaluate what they could and couldn't do with the move to the PS4 as being able to be realistic about it's capabilities.

In any case, I think this is about the time the game should have even been announced. Maybe at the last E3 which would lead to this reveal with gameplay, then to the demo and whatnot. While the original trailer and whatnot was pretty cool, it seemed to be released as a concept with no real work being done on it. Considering how much Tabata has done in the time he's taken over, I can see this coming relatively quickly!