and**… a few unknown (?) new features in Cubase 6:**
–>> Operations affecting selected channels: You can add or remove a VST plug-in to or from all selected channels at once by holding down [Shift]-[Alt]/[Option] and selecting the desired plug-in from any of the insert effect slots.
With the same key combination you can also activate/deactivate effects or toggle their Bypass state.
For Send Routing use this key combination to route all selected tracks into a FX- or Group-Channel, to activate/deactivate a Send slot or toggle their Pre-Fader state.
YEAH!!! I´ve been waiting for so long!! much faster mixer workflow!
great. 
Export Audio Mixdown > Post Process > Open in WaveLab: You may notice an additional “Post Process” area in the Export Audio Mixdown window of Cubase 6. By selecting “Open in WaveLab” any finished audio export automatically starts WaveLab and imports the exported audio files from Cubase 6. This feature is available as soon as WaveLab 7.0.1 or higher has been installed on the system.
Unlimited audio tracks (Cubase Artist 6: 64)
Unlimited MIDI tracks (Cubase Artist 6: 128)
256 physical inputs (Cubase Artist 6: 32)
192 kHz > sampling rate support (Cubase Artist 6: 96 kHz)
256 group channels (Cubase Artist 6: 32)
Unlimited instrument tracks (Cubase Artist 6: 32)
and many more. 
My conclusion: LOVE IT!!!