This most likely won't be where you heard it first, but no self-respecting (Atlanta-based) aviation enthusiast would let it pass... The Delta / Northwest merger was approved by the feds yesterday, and the pending lawsuit in California was settled. This officially marries the two airlines. The Atlanta Journal-Constitution has all the details.
Now then... this perhaps you didn't know: dalflyer (nee simuflite) over at Flickr reports of a rumor that a Northwest 747 is in the paint shop at an undisclosed location being repainted in the Delta colors as we speak, and shall be presented to the public within the next few days. Pretty soon, they'll be a regular sight in ATL, I suspect.