Four digital video inputs instead of two
HD capable component inputs instead of just SD
Top quality wideband BNC RGBHV analogue video outputs
10 bit video processing chain instead of 8 bit
Upgrade ability to new ABT SD de-interlacer
And a few others, like input configs
The VP30 is more expensive, and probably not worth it on PQ alone - you will have to decide whether the improved interfaces are worth it to you. However, the informally announced processor upgrade for the VP30 ONLY is likely to sway things.
I should hang fire for a few weeks until we can see what the new processor will really deliver.