Never seen it
I have put some reasoning behind my fanboy theory.
1. If we do hypothetically go back to Vice City again, I just don't see Rockstar ditching the modern era. They love doing that too much, and it wouldn't fit with the other HD games, it'd just be weird going from 2008 to 2013 to 80's. I believe that the overall series Rockstar will deliver will be neat.
But I also don't see them doing Vice City without the 80's. Nobody wants Vice City without the 80's. Los Santos - Rockstar could build in the modern era, as LA is always a cultural hotbed (New York too) but Miami
is the 80's.
2. As ambitious creators, Rockstar probably want to come up with a new twist on the "character jumping" mechanic. They don't like repeating the same thing every time. (There were clearly issues going on with keeping all 3 protagonists relevant to GTAV's rising action, too.)
This character/time hopping would answer both issues and create an insanely ambitious game; a world that is two worlds (centred around one rising action and its fallout of revenge 40 years later) which I think Rockstar would see as a kind of technical challenge they'd want to do.
There are a lot of things just as challenging they could do, but idk, to me this is what feels right. We need to have a HD Vice City, but it can't be just 80's or modern without deeply missing something. Until we get anything official at all, I'm pining for the fantasy day rockstar releases a trailer of HD Vice City in the 80's, and then releases a second one that takes place in 2018 (or, alternatively, we get one trailer with both spliced in, with just enough evidence of 2 time-zones for fans to go nuts with theories).