I believe there is a phase in requirement where Dish will have to carry all the channels in a DMA if they carry any. I believe the first phase is 30% but I don't remember the deadline date for that. Regardless, Dish is going to need a lot more bandwidth in the future for locals.
Regarding the 86.5 W slot, Dish's FCC application was for reverse circular polarization to avoid interference with the Canadian DBS slots at 82 W and 91 W. Obviously Dish's on-orbit satellites such as E-4 or E-8 don't have this capability therefore their use can only be in the U.S. away from the Canadian border. I don't think Dish at this time has the authority to use the 86.5 W slot in Mexico. Dish could build a new satellite with this reverse polarization for CONUS use at 86.5 W but it would require a new LNB for subscriber's dishes. Another option would be to eventually build a spotbeam satellite or satellites for this slot and since it appears that most if not all Eastern Arc national programming will eventually come from 72.7 W, a standard 100.x dish could be used. These spotbeams could only service DMAs that aren't too close to the Canadian border. It should be noted that the 77 W slot may also have this coverage limitation for the Canadian border for both CONUS and spotbeam because of possible interference with the 82 W slot.
I believe the proposed move of E-4 to 86.5 W is only to try to hold the slot and not use it for any subscriber porgramming but I could see E-8 being used there. I am not surprised that Dish is raising the possibility of E-3 being moved to 148 W. I don't think Dish can really count on E-3 to reliably help out E-12 and E-15 at 61.5 W and besides E-6 is there as a backup but it is also a backup for 72.7 W. Once QuetzSat-1 is launched to 77 W, in the second half of 2011, Dish will have E-1, E-3, E-4 and E-8 to fill in spots unless one or more of them die before then. When E-16 gets launched in 2012 to 61.5 W on a Zenit by Sea Launch, E-12 will probably be freed-up unless Dish plans to use both E-16 and E-12 in spotbeam mode from 61.5 W. The uplink limitations of E-12 make its continual use in spotbeam mode less appealing after E-16 is operational. It can be used in CONUS mode but only on 13 TP frequencies.