Straight from the FCC website is the official announcement from the FCC green lighting the merger of Sirius and XM.
COMMISSION APPROVES TRANSACTION BETWEEN
SIRIUS SATELLITE RADIO HOLDINGS INC. AND
XM SATELLITE RADIO HOLDINGS, INC.
SUBJECT TO CONDITIONS
SIRIUS SATELLITE RADIO HOLDINGS INC. AND
XM SATELLITE RADIO HOLDINGS, INC.
SUBJECT TO CONDITIONS
You can read all about the conditions Sirius and XM made here in this PDF.
What amazes me is that on word of the announcement both Sirius and XM’s stock prices are dropping like a rock from an Airplane. Guess now would be a good time to dump some money into the stock if you are in for the long haul.