You can currently save VST presets and set them differently for each zone so this part already works. You can basically do want you want already by creating different zones for different content. What is planned to happen is to make the zone switching automatic.
Some work has been done in V18 on this, but it isn't finished yet. The last info was back in August according to the build change log:
18.0.33 (8/23/2012)
6. Changed: Revised how zone-specific settings are stored (groundwork for the coming zone setting presets feature).
I think what will happen is that you can assign zones to your music/movies based on your own criteria and playback will be automatic.
For now, I would just create zones like 2 channel music, multi channel music, music video, movies, etc. and then set the DSP and VST presets for each zone. Just select the zone you want before playback and then choose your media. All other settings for the zones can be identical such as audio device, method of volume control, video settings, etc.