I reckon it'll be the 70's. Much as I loved the Miami Vice 80's of VC, the trend seems to be prequels. It could be good though. Good tunes in the 70's, the music in LCS was crap! (thank R* for R* Custom Tracks :-))
As for the protagonist, Kent Paul: Be great to play as a Brit, but nahh, he's a pussy (I think. A while since I played VC). Tommy: Nope, he wouldn't be there. It won't be anyone that turns out to be an arse.
I reckon it'll be someone who we've never heard of who has such a cracking back story that we feel that we know him. Let's face it, these games are so well done that R* must be able to create someone who's known but never seen or referred to. Just ffs get the tunes right if you read this R*.
Oh, and if you do and you need some creative input who can do firewalls and IPS and stuff, I'm your man ;-)
Oh, and another thing, the quality of the voice talent seems to have dropped along with the quality of the music. Anyone agree?