I'm have no complaints with the current amount of content, but this might make sense.
I think when it's officially released there will be a day 1 patch to include more content.
Rockstar must've known the game would be leaked prior to release so they may have kept some content unreleased until the 17th (or maybe locked). Obviously they didn't lock much of it because they knew footage would be leaked so didn't want to deter people away from the game.
For example, there are multiple barbershops around the city, yet only a few haircuts per character? Seems to be a waste at the moment.
What about a bunch of iFruit apps to be released?
And the Casino?
Have we got more to come?