GTA 4 came out in 2008, the final DLC came out in 2010, GTA V first arrived in 2013 but still hasn't come out on all platforms nor have heists. Plus they normally have expansions or DLCs for each generation which haven't be announced.
Is R* 1/3 of the way through the next game? Not a chance.
As far as I am aware nobody knows about the hard copy of the game. I think the theory is that it is a non steam version.
The retail versions have to be run through Rockstar's Social Club which is why I preordered through steam, although that has just added me another level of DRM


