As title says, AMEX discontinues companion certificate benefit for DL Gold AMEX cards as January 25, 2013. However, if account was opened from January 25, 2012 to January 24, 2013, you will receive one companion certificate the first time you renew the card.
This is a quite strange move from AMEX, because they promote DL Gold card very aggressively, and now there are no real benefits of this card (except a free bag).