There have been plenty of rumors leading up to Samsung's announcement of its next superphone, the successor to the Galaxy S II. Our own sources inform us it'll feature a quad-core processor that delivers 'superlative' benchmark results, while a recent Amazon listing suggests a 4.7-inch display and 12-megapixel camera will be part of the equation as well. The launch event is scheduled for May 3rd in London, and we'll be there live.