Not sure I can wait until April as my current device (a now ancient history Nokia 6133 flip phone) is dying a slow death every day.
My understanding is that it takes months for new phones to come to market. The SGS II only showed up in stores (TMobile at least) in October. I definitely cannot wait until Q3/Q4 this year for a new device and my understanding is it will take that long to see the SGS III in the US. Are you privy to a quicker time line for the SGS III launch in the US?