Short answers, pulled from the story.
The bright spots on Ceres consist primarily of hydrated magnesium sulfate and sodium carbonate rather than pure ice. Spectroscopic data confirms these deposits formed when briny water erupted from the interior and sublimated to leave behind only the salt.
Scientists reported that the bright spots on Ceres may be related to a type of salt on the 9th of December 2015. Reflectivity studies from September 2015 suggest that the spots are probably salts rather than ice.
Spot 5 stands out at coordinates 19.86 degrees north latitude and 238.85 east longitude within Occator crater. The spot in the center of the crater is named Cerealia Facula while the group of spots to the east carries the name Vinalia Faculae.
These names were approved by the International Astronomical Union on the 26th of November 2016. The central spot received the name Cerealia Facula and the eastern group was designated Vinalia Faculae.
A haze fills around half of Occator crater without extending over its rim periodically appearing around Spot 5 adding credence to outgassing theories. Observations suggest recent or ongoing cryovolcanism releasing vapor into space from beneath the crust.