I can't confirm that. I don't remember exactly what they rehearsed but there was nothing new to me.
But "So Much" appeared on Tony Levin's setlist sheet, see here.
Anyone else maybe can provide better info?
I confirm. I was there during soundcheck in Verona. They've rehearsed loudly in the early afternoon some "Sledgehammer" repetitions without PG. Probably just for checking the PA in the Arena. Then they came back with PG in the late afternoon (I think it was 5 or 5.30 p.m.) and they've rehearsed again without the PA on. So you can't hear very clear because they were using only the sound from their monitors onstage (it was barely audible only staying very close to the stage). At this point they've tried out 2 or 3 times different portions of a new song not in the final setlist, and I'm sure about the song title because the incipit of the chorus is the title of the track repeated twice. It seemed a full band, mid-tempo slightly melancholic track, close to "Live and Let Live" or "Olive Tree" style for the little I can hear. The title of the song is down here to not spoil: