He will not go back to Lazio, it seems:
http://www.corrieredellosport.it/Notizie/Calcio/33772/L%26apos%3Bagente%3A+%C2%ABStendardo+non+resta+alla+Lazio%C2%BB
In a new interview with him, he said that Lotito will be the one who will decide his future in the coming month:
http://www.piazzadellaliberta.it/2008/06/09/stendardo-lotito-decidera-il-mio-futuro/