An on-air promotion broadcast on XM Escape has confirmed the November 12th date rumored this morning. Additionally, a jock on Sirius' The Pulse also announced the date, according to an Orbitcast commenter.
Listen to the full audio below:
What's clear is that the date appears to indeed be true. What's not clear, is how valid the 50 combined channels rumor is. One rumor down, one to go.
UPDATE: The audio is sourced from aegrotatio at XMFan.com. Thanks Alex!