Overnights.tv confrim Five USA and Fiver rebranded date.
Five USA and Five USA +1 will be rebranded as 5 USA and 5 USA +1 from the 7th of March, 2011.
In addition, Fiver and Fiver +1 will be rebranded as 5* and 5* +1 on the same date.
http://www.overnights.tv/public/content/News.aspx