I was curious about this as well so I called SSC and Carla Answered (on a Sunday no less!)
The short answer is that so far ONLY THE ROLI SEABOARD BLOCK has been tested to be
working, plugged directly into the USB port on the back of your Paca[rana].
No Word yet on if the lightpad block works or if chaining as 2nd Seaboard block without plugging it in works, etc.
Still very interesting. Seems like a good opportunity for any Block owners to do some more thoroough testing.