I've just finished the Vertikal Resource page where you can find info about the preorder offer and also download playable demos.
The demos are all C's (plus lowest A) and two full octaves. Samples have a max length of 8 seconds and then they are cut off.
First out is the GS3 version of the Vertikal Jazz Perspective. Complete with original impulses for pedal down and instrument resonance.
There are also some pictures from the recording session for your entertainment