Dish has applied to the FCC to suspend operations at 148 W. Not suprising because of the E-5 propellant issue but Dish also noted that it wants to move E-8 to 148 W in 2011 after QuetzSat-1 is launched to 77W in August of 2011. I know this is almost two years from now but this also indicates that Dish has no intention of moving E-6 to 148 W. Here is the FCC website link:
FCC INTERNATIONAL BUREAU
FCC INTERNATIONAL BUREAU