Well, coming up with a choir library which lives up to the high quality standard of the VSL team that we have grown accustomed to is not an easy undertaking, especially if you want to integrate seamless wordbuilding.
I imagine that especially in the case of wordbuilding that there are certain walls you run into if you want to maintain a sampling purist approach.
With that in mind I wondered about the new feature in Kontakt 4, Authentic Expression Technology, which allows for seamless morphing. If it truly works as advertized this may just be the kind of technology which will enable seamless wordbuilding.
I don't know if the VSL team has given some consideration to incorporating other additional technologies that will complement the sampling approach? If it does not change the character of the sound in a negative way and it yields more convincing results (especially in the case of wordbuilding), then using additional techologies to the sampling approach might be worth some consideration.
But then again I'm not standing in the shoes of the team working on the choir library, so, it's just a thought. Any input from VSL?