I guess it's a good thing I didn't get my hopes up after hearing what they showed of Pokemon Sun and Moon today.
If they did show off footage, I'm sure it wouldn't be too much. I still remember that it was that same show when we saw our first glimpse of the gameplay of HeartGold/SoulSilver shortly about a week after it was announced. We only saw footage of the player and his Cyndaquil walking around New Bark Town. If it happened with Pokemon Sun and Moon again, I bet it would be similar with them briefly showing off one of the towns to give us an idea of how the overworld would look like.
Good thing we have CoroCoro leaks coming out some time at the end of next week when the real fun begins!