Yeah I think the first trailer will be around that and then the launch trailer will be around 7 minute mark. That seems to be how Square and Nomura roll these days.
EDIT: Actually as said above there could be a live demo even. Nomura did say he wanted people to see the game being played the next time it appears.
" when this radio airs there will be E3 going on at US. I will be at E3 for KH1.5 promotion. And there is a certain information announced at E3 which I cannot talk about at this moment. But I feel like everyone knows what this information will be anyway."