well to be fair the 3rd one from a director's point of view was a masterpiece, the audience had built up this father / son bond between man and machine towards the end of the 2nd film and for it's time the film was very very impressive. To have, in the 3rd one, arny, hero of no.2 pitch up and act like a douche again had a take back effect upon most people. Perhaps it was this reaction that caused a fair few people to simply dislike the film, i know i for one was a bit negative towards it until i took a step back and appreciated it.
Furthermore i know we assosiate the Terminator series specifically with the hulking Austrian but we have to achknowledge that it was always going to end with the little kid who helped blow up a computer building right? Granted he looked like a scared rabbit in the third one (and nearly gets killed by one too at the begining
) the new film, if they want to make it a good one, has to introduce us to reece (which wont happen on the basis that he's probably older than Gandelf by now), involve us more in time jumping, show us how the Robots are produced etc, how what controls them thinks, and basically everything about the future mentioned throughout all 3 films.... we know for a certain assumption it wont all happen, especially as arny really has a small part to play in the new film if what you say is correct.