Engadget write in an article that UK retailer Phone4U and Samsung will reveal “something” on the 30 march.
We dont know and Engadget do not know either. But becouse a picture on a Phone4U shop show the message: “Coming 30.03.12” and a Samsung logo is at the top we could presume that is a Samsung Galaxy S3 presentation. There is one more hint. The picture was taken at the same location where the retailer lounched the Galaxy Nexus.