I wonder if Starhawk can be a gameshare, since WarHawk was not
Well about the full game I don't know but they already said that you would be getting not a separate list of trophies which means that if you are already a playstation plus subscriber, you will get the single player campaign and won't get a platinum. unless you purchase the multiplayer and finish it.
It is different than killzone 3 multiplayer.
Also with this option of not enabling someone to play DRM I doubt it will be on it because the 2 games are split but we never know. Starhawk Multiplayer Edition
Price might change if 50% discount can be done on PS PLUS