I genuinely think it should have surfing, I mean come on, look at the water, fuck. Skateboarding would be so great, but it won't have that and I don't think it will have surfing either.
I really, really want a decent amount of accessible interiors, it can't be V all over again, god it was lacking in there. I want a actual good and fun hand to hand combat system. Lucia clearly is in a cage fight of sorts, so she can kick and punch I bet but Jason should have really fun combat moves too. IV and V really failed there, it's not fun by any means.
Cars should handle a bit more like IV, or well, feel a little more like that. Something about the driving in V which makes it.....not nearly as enjoyable as IV. Way more player input/freedom during missions. V definitely had better variety than IV had, but it still lacked real freedom. And while I adore RDR2, this aspect was extremely lacking there.