Well I wouldn't want to spoil anything. I can't answer mahius' question because I don't know whether I played enough of Ground Zeros to warrant any additional packages in V, not to mention I'm not sure when you start even managing your own base of operations yet.
What I can say is the first 30 minutes I have played have been one of the most intense, confusing, awesome and thoroughly Kojima introductions ever. I think I said to smr that you wouldn't miss out on much but there are already throwbacks to the other games. They're not deal breakers so far, but they definitely do re-immerse you back into the world of MGS.