Rewatching the trailer frame by frame, a few things that I noticed
-During the title screen, I seen 2 Sabre GT's, hopefully more muscle cars turn up
-Trevor has a tattoo on his neck, its a dotted line and its says "Cut Here' lol
-The vehicle Michael's son falls into from the 'sailboat' is a Sentinel, not the Feltzer I thought it was
On a side note, I think Michael is named after Michael Mann, director of 'Heat' and 'Collateral.' Heat was a major influence on the 'Three Leaf Clover' mission in IV. I'm assuming also the heist missions in V.
Michael is a retired Bank Robber, bearing a resemblance to Robert De Niro, note the Grey suit