Full steam ahead on the -8's (26 total), also discussions are on going to operate an additional 20 on top of that (Crew Leasing).
The -8 economics simply are too significant of an advantage, once the -8 arrives the -400 will become the new -200. The -8 has an overall 14% lower operating cost as compared to a -400 this easily justifies it's purchase and utilization on high capacity routes.
The only issue now is the 6 month delay due to the Boeing strike and delays associated with the engineering staff being tasked with the 787 program to get it flying.
One thing is for sure, fuel will not remain at the current low levels. Atlas by dedicating to the newer generation aircraft will be positioned with modern fuel efficient aircraft and remain insulated from petroleum mega-spikes or even sustained $100 oil.
DBW