Let me address the two issues seperately :
a) PDK will be the next ATL airport to go commercial. It is not a matter of if, but a matter of when. No, I don't see it happening in the next few years but once MARTA expands into Gwinett County, it will truly become the airport of choice for the Northsiders. Strangely enough, it may become more of a HIGH PRICED airport as a result, rather that the discount carrier home that most may imagine.
b) The Atlanta City Council actually took a vote this past year on whether or not to sell the commercial naming rights to Hartsfield Atlanta International Airport. Councilman Rob Pitts is leading the charge to raise additional revenue for this city through this program. However, a huge obstacle is that BOTH Delta and AirTran have expressed their reservations about this, since they both fear that the other corporation will buy up the name of the airport. Imagine "Welcome aboard Delta flight 1908 to AirTran International Airport in Atlanta". Sorry - I don't see it happening UNLESS there is a proviso that the naming rights have to be totally unrelated to aviation.
"The A340-300 may boast a long range, but the A340 is underpowered" -- Robert Milton, CEO - Air Canada