Well, this is great news indeed!
After all these years finally seeing an UE3 based game coming back Linux is just... awesome!
While i totally gave up hope on this engine a long time ago, there might now be a small hint of light on the horizon for future titles running on UE3. At least i could foresee some more jobs for Icculus in the future, which is great in itself
Still wouldn't hold my breath for RO2, though... but u never know. Best bet is not to get excited at all, this way you won't get disappointed in the worst case and happily surprised in the best case
cheers,
gitano