From my personal point of view I would speak more about an expansion than of an improvement.
I believe the question should be:
How could we come even closer to a real performance? If we ask this question we need...
- some more articulations (min 4 layers)
- most of the articulations should be available either with Vib or without Vib - if possible with "Sweet Vib" and "Normal Vib"
- 4 levels with the legato samples (just as sus4Levl-perf - it allows nice X-fading sequences)
- more levels with the dynamic samples (3-4 for dim/cresc, 2(-3) for sfz, etc.)
- Two different Violins
- Two different Cellos
- ...
Although I think Dimension would mean an improved blend and ANY new articulations and/or more bowing flexibility would be GREATLY welcomed... I think his list pretty well sums up the most important aspects of a future VSL string library. Perhaps, like their other products, and unlike their Dimension Brass... we will see a Dimension Strings expanded library. The more able to sound realistic, and more capable this library is... the more of a "I need this library more than any other" people will react to it. So in light of 'those other libraries', I doubt VSL is thinking much differently than us users are about what this library needs to be. And ultimately the point I wanted to make in that is that more divisi AND more expressive possibility are inseparable; most users seem to want both and will keep asking for it until both are had.
-Sean