I'm kind of guessing that maybe Microsoft and Sony gave technical details out of their next gen machines a long time ago to the big developers (hence why we will be seeing games at E3)
If you look at a similar game with a close release date which is by Ubisoft "watchdogs" on their Pre-order page on their official website at the bottom they list all of the consoles (I am going to guess that they are their to show which units it will be released upon, I see no other logical reason for them being there)
http://watchdogs.ubi.com/watchdogs/en-gb/purchase/Also from a marketing perspective I cannot imagine that Rockstar (and other developers) will have spent 5ish years developing their biggest ever GTA which will ship millions of units on the current consoles, to then not take the opportunity to then sell the same game all over again when the next gen consoles come out, more than likely to the same people who bought the same game on current consoles.
Anyway.... yes I am looking forward to the new GTA and I had it pre-ordered as soon as I could. I have little to no interest in any other games that been released recently but for this one I shall be booking a week of work.
The same colour blood just pass through our veins and tears taste the same when they splash on your face. Cant separate and still carry the weight, gotta heal get away from the fear and the hate. Gotta shake free from them chains.