Na, Samsung have officially announced that it'll be..err..announced on May 3rd.
I'm expecting it to be slightly underwhelming to be honest. An awesome handset, but we're that ready for it, it can only under deliver on some of the rumours.
I think we'll see 4.6 (I hope no bigger than 4.7 at absolute max!!), 576 X 1024 Super Amoled Plus screen. I think it'll only have 1GB of RAM (which I think is disappointing, as it's what the SGS2 has), I think it'll be Quad Core at around 1.5GHz and will probably be available in a 16GB and 32GB version. I wouldn't even be surprised if they kept the camera at 8mp.
Nothing there that will make me upgrade really. Means I can skip a generation and go the SGS4
Unless they really release something special!!
Though rumours are of waterproofing, wireless charging, and these sorts of advancements are nice, I'm not sure any of it really appeals to me THAT much. NFC is probably in that category too.