rockstar says gta 6 is extremely tough to reveal because of all the cool stuff

Caught the Kinda Funny interview clip and Rockstar basically said GTA 6 is "extremely tough" to show off because there's so much cool stuff in it. That's the whole quote and it's driving me nuts.
Like we've already seen two trailers and that extended look back in August. If they're still saying it's hard to pick what to reveal, what are we missing? The map, the systems, the random encounters, all of it. They've shown a ton and apparently it's just the tip.
I remember Rob Nelson saying the devs still find new stuff in their own game. Now this. It feels like Rockstar is sitting on a pile of features they can't even talk about without spoiling something bigger.
What do you think they're holding back? The online mode? Some crazy weather system? Maybe the whole second half of the story is a different tone and they don't want to spoil it.
Source: Dexerto · Curated content.
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