1 - If you saw SampleTank at IMSTA, it was the Beta version, not including the full library and such. We have been testing betas internally for a while and just started with a small team of non IK employees this month through to launch. Dates are iffy right now during beta testing, but we are planned for the end of the 4th quarter.
2 - I'm curious to know the demo guys name. It find it odd that he didn't know a lot, which make me think he wasn't an official IK employee or could have been an IK artist/engineer/musician. There wouldn't be any details in the demo on SampleTank 3 as it isn't out yet.
Provide me with a name and I'll check in this week to see if I can sneak a screenshot or something for those curious. No guarantees though...