The ATI Catalyst driver 8.3 is now available in Envy Legacy and EnvyNG. You can check the release notes of the driver here.
As regards the future of EnvyNG, I’m glad to say that the GTK GUI for EnvyNG 1.1.0 is finished and the QT4 interface is in good shape. I only have to solve a problem with the logger in QT4 since using QProcess and TextEdit as a virtual terminal (a la VTE) makes the log look a bit weird. I’ll write a post about this.
EDIT: if you had problems with Envy Legacy and the ATI driver, try version 0.9.10-0ubuntu7