Audio Impressions’ Realtime Instruments: I have been looking into this and I am impressed. Go here and watch the whole movie:
Real time articulation changes, distributed processing, real humanizing, divisi sizes do not change just because you play different numbers of multiple notes, realistic glide, variable room size (multiple variable mikes), a massive number of instruments available, delivered on hard drives, 3rd party library integration and more. These guys are really going for the orchestral realism holy grail. Even with the funky video sound, it sounded very good. I would like to hear some demos when available.
Gary Garritan has commented on this product in his NAMM report. It may be a bit pricey depending on the depth of your implementation. The website video may be the most recent demo they have at this time.