My 2c worth here... definitely a dimension strings - something to compete with LASS. I have resisted buying LASS because I prefer the VSL sound and I believe they will eventually outdo it (as per the VSL MO), but the usefullness of writing with proper sections and not having to double up larger sections to get intervals, is really helpful. Having the humanize feature in the software would make a divisi string section even better.
No need whatsoever to re-do chamber strings, or the solo strings IMO, unless releasing a few new articulations to add on to the existing library (if possible). The full orchestral library is always going to be good for single lines and just for another sound. But IMO I strongly think VSL should do a new full divisi based library that out does the competition and then some - something that will last another decade.
However, even single lines will sound better with divisi sections playing together - the attacks and the modulation of the humanise feature working together will just give an amazing realism.
As for articulations, we can always use more. Also in a previous thread some months ago someone mentioned really being able to get really super pianissimo sounds - I agree with that too. The full spectrum is always good :)
No criticism on existing strings from me, but they are 12+ years old now (and still standing proudly). But, divisi is the way and the VSL software is clearly set up to take advantage of that. They'd be crazy not to do it (sooner than later though!!!) :)
Lastly... maybe not possible but wouldn't be such a bad thing to have a wet and dry option as well - so we have the traditional dry stage recordings but also - somehow if it could be done in the same session a more distant microphone with more early and some late reflections. Not exactly a wet version by any means but something certainly more coloured.