Its being said that Yahoo will announce its Product for small publishers in Contextual ad panel at San Jose SES.
So if the YPN launches on 8th August, who is going to test it?
For testing YPN you will have to remove all of your Adsense ads from entire website (Accoring to Adsense Policy).
For me I will surely test it. A 24-48 hour Test will not harm my earnings much. :)