I think really what this thread is asking is "should the Green Goblin be Norman Osborn, Harry Osborn or someone else".
Pretty much is it is anyone other than Norman I am going to hate it. The rumors out there are pointing at Harry, which will bother me a lot. But at the same time there are rumors that Harry will be Venom, which also bothers me a lot, but just shows (hopefully) that these rumors are meaningless.
The Goblin (I think for the general audience they should just drop the "green" nomenclature) should be and needs to be Norman Osborn.
I wouldn't mind him being disfigured due to the serum, causing him to be a recluse. So what I'm saying is that he wouldn't wear a mask as the Goblin, but his mask would actually be used to make him look like Norman. That should be shown, Norman taking his mask off to be shown as the Goblin.
Also please, no dual personality garbage! Just straight forward power hungry, possibly slightly psycotic Goblin!
I would like the obvious reveal to be at the end of TASM2, right after he drops Gwen causing Peter to kill her by accident. He uses Gwen to facilitate his escape and the movie ends with Peter cradling Gwen's lifeless body and him screaming.
The after credit's scene shows him in a lab/lair, surounded by equipment and such that includes monitors and pictures of things like the Rhino, a winged harness, the Black Cat slinking across a roof, Curt onnors in his cell, a special electric harnessing suit, a poster of some Illusionist's show, etc. Maybe even a bunch of information on Peter Parker/Spider-Man. He then removes his hood to reveal the Goblin's face (not Norman's) and he then laughs! Fade to black.