La Repubblica has a nice photo:
According to the brief (Italian) report, it’s about 150 cm in height and is missing the pedestal, which archaeologists are hoping might show up in the next few days. The commune superintendant — Umberto Broccoli — suggests this piece is the ‘little brother’ to one from the Campidoglio, which I think is this one. It also (to me, especially in the treatment of the moustache) seems to have affinities with a Marsyas in the Istanbul Archaeological Museum:
Of course, Marsyas was punished for challenging Apollo and/or stealing his aulos … in art he is often displayed in this ‘bound’ position, but his ultimate punishment was to be flayed …
rogueclassicism 
If you would like more information on the Villa delle Vignacce excavation as well as the field school at Vignacce (which is in the 5th season) please visit our website or contact us directly. Marsyas was a Silenos who had the temerity to challenge Apollo to a musical contest (and was flayed alive for his efforts) The choice of the violet or red veined marble like the typeused in the statue was to give the viewer a bloddy image of Marsyas’ tortured body.
We have attached a link to the comparison piece at the Capitoline Museum in Rome. http://www.sacred-destinations.com/italy/rome-capitoline-museum-pictures/f10_164.jpg