For now CDRWin, Feurio!, DiskJuggler & CDRecord support writing up to 99 minutes but most likely all CD-R recording packages will be supporting the new media in the next few weeks!
Keep in mind that all CD-R99 media will be recognized as CD-R80 media which can be written up to 79:59 minutes, this is because 79:59 minutes was the maximum possible recording time. Going beyond this value will result in a negative track value (this is usually the cause that some software will fail to work!).