Access to first pre-qualified S2 data is available from https://scihub.esa.int

Just search for S2A* and you will find the first S2 data over North Italy between the many already existing Sentinel-1 data.

Please note that the data are pre-qualified, current limitations include:

• Large absolute geolocation error (several hundreds of meters).
• Co-registration error between bands (within VNIR bands, larger between NIR-SWIR bands).
• No land/water and cloud masks available.
• For some products band 10 has not been radiometrically corrected.