The current thing to discuss in Delta forums is a change for SkyMiles loyalty program from a miles flown program to a revenue spent program.
I think there are enough places to discuss the rumor already so I will just say what I think.
I have to fly on the cheapest airline within reason (which is why I fly Delta at all living in a US Airways hub) so I have that working against me, but since most of my tickets are booked less than 7 days in advance I often have higher fare class tickets. A 500 mile, 2-leg each direction trip often costs $500-$700 so this might work to my advantage. I will have to see how everything plays out with the earning to know if this will actually help me.