7 minutes isn’t just going to be an announcement. If that’s the case, what are they doing for the other 6 and a half minutes? If it’s only a teaser trailer, what are they doing for the extra 5-6 minutes?
If that’s the case, they probably have updates on Pokémon Let’s Go.
They always do it like that for new generation announcements... spend a few minutes talking about some random stuff, then show the next generation trailer, end of Direct. It was like that for both X/Y and Sun/Moon. But of course, people forget things.