Italian guys who where there:
http://www.rally.it/test-yaris-wrc-secondo-giorno/
They're the ones who took pictures and share the videos.
Basically they said breaks and suspensions were tested yesterday (I think the engine was the focus the day before, but I'm just guessing).
Both Suninen and Hirvonen tested the car, the difference between the two was clearly visible in the stage. ;)