As of today (3/8/2002), Mobil has put the Tri-Synthetic back into the "Synthetic Motor Oil" Group. They have removed the Semi-Synthetic group from the link provided earlier. Also the data link is still to the old SJ Mobil 1 (was linked to the SL for a while).
Also on the Mobil1.com site, it started a flash intro of releasing something big on 4/15/2002. That must be for the new SuperSyn.
So the great confusion continues. On day 1, Tri-Synthetic was synthetic, on day 2, it was semi-synthetic, on day 3, it is back to synthetic. Wonder what they will call it on day 4?