Rio today announced a new 4GB version of their Rio Nitrus MP3 player. The previous version of the Rio Nitrus was a $219 1.5GB device based on Cornice's previous 1.5GB mini hard drive. The 4GB version is based on the previous design and will have an estimated U.S. street price of $249. No indication is given as to the hard drive technology used in the new version, but readers will note that Cornice just announced a 2.0GB version of their storage device. Apple has been widely rumored to introduce new mini-iPods.