I beieve the amp the Janszen rep was using was a microZOTL. The Janszen prototypes aren't traditional 'stats. They're a two way design with a dynamic woofer. The 'stat tweeter has a battery powered bias supply and seems to be efficient enough to run from a normal headamp since it's just handling the treble.
Yeah, the MicroZOTL was at the Janszen table, but they also had MrSpeakers' electrostats paired with a new prototype stat amp at the LTA booth. It was the large amp on the right side of their exhibit.