The European Space Agency (ESA) has released the Sentinel-2A orthorectified products.
Images are available for free at this link https://scihub.copernicus.eu/s2/ . Dozens of images are already available covering different parts of the world (acquired during the last few days), and in a few weeks the satellite should cover the whole world. In fact, Sentinel-2 is in the Ramp-Up phase that will bring data acquisition to its full capacity.
The following is a very interesting video by ESA Web-TV that illustrates the characteristics of this new satellite.