Where you actually surprised by this? There was obviously going to be online content. RDR's multiplayer was excellent.
Sony unveiled GTA V's PS4 remaster on stage at E3 and it's since been released on Xbox One and PC, so don't take anything from that announcement. Expect a Red Dead trailer at Sony's conference in 2017.
Trailer looked sick by the way. Nothing surprising in there but there's going a whole year of info being dripped out so I wasn't expecting loads of reveals from this.