The NASA Astronomy Picture of the Day 05/08/2013 shows the Supernova and says: "as there is a possibility that the glow of a classic supernova will soon emerge."

Namely between the 10th and the 12th of May 2013 ...

[link to gcn.gsfc.nasa.gov]

Explanation: A tremendous explosion has occurred in the nearby universe and major telescopes across Earth and space are investigating. Dubbed GRB 130427A, the gamma-ray burst was first seen by the Earth-orbiting Swift satellite in high energy X-rays and quickly reported down to Earth. Within three minutes, the half-meter ISON telescope in New Mexico found the blast in visible light, noted its extreme brightness, and relayed more exact coordinates.

[link to apod.nasa.gov]