No no no no noooo
I'll go against the grain here, I love my S3.
I did slate the design when I watched the sammy press conference, but having had it since launch I can honestly say it's spot on, size, weight, functionality all perfect for me. yes it's plastic but I don't care, it's not about cachet so a titanium monoframed chassis wrapped in carbon fibre would be wasted upon me especially if it added to the price of the damn thing.
TW is a very mixed bag, the aesthetics are terrible I concede but Samsung do bring some nice touches to android, I'm sure that the S4 would be adopted by communities such as xda etc just like the S/S2/S3 have been which means custom skins anyway.
Thou shall not remove the physical home key, at the very worst go capacitive but with raised bump / ridges to indicate it's location, no on screen button malarkey please Samsung it's not big and it's definitely not clever!! It's all a matter of personal preference of course but as a long time Galaxy user I would hope that Samsung recognise a winning formula and stick with it, the odd tweak here and there is allowed but don't go making sweeping radical changes.