So it’s basically confirmed: TakeTwo registered the domain gtavicecityonline.com – This is, in my opinion, a clear hint for a Vice City online mode in the future. Rumors say, the GTA 6 map will be Vice City (or a small part of it), so is this a confirmation? In my opinion: It can be!
The domain was registered already in 2009, maybe Rockstar had plans back there. The last update of the domain wasw on: 2020-11-22T12:09:58Z
So, we can say for sure: The domain has been registered.
But has it to do with GTA 6? Not sure, but it can be.