Sorry about the length of this post but maybe some of my speculation will give Dish some good ideas.
Dish will use the 61.5 W for an all MPEG-4 service/package in the eastern U.S. after the succesful launch of AMC-14 in March. This maybe started in the third or fourth quarter of 2008 to allow for the migration of internationals off of 61.5 W. Dish will use 7 - 9 of E-12's TPs for spotbeams to provide HD locals. The double power capability of AMC-14 will allow Dish to reduce the error correction and put more channels per TP. Dish will be able to mix SD and HD channels on each TP since they'll all be in MPEG-4 allowing Dish to offer 150 - 180 national HD channels and still provide all the SD channels it currently does. Realize that there won't be a need to carry the SD version of a HD channel that is duplicated now so the number of SD channels will be quite a bit less. The E-3 satellite will be moved to 77 W where it will provide HD locals to some of the smaller cities in the southeast U.S. avoiding any conflict with the Canadian DBS slot at 82 W. Dish will come out with a modified D1000 dish to get both 61.5 and 77 W.
With the succesful launch of the E-11 satellite to 110 W, Dish will move the E-6 satellite to 129 W prior to the Ciel-2 satellite launch and the E-8 satellite to 119 W. I'll come back to what happens at 119 and 129 W later. The triple power of the E-11 satellite will allow Dish to significantly reduce the error correction allowing more channels per TP. For example, instead of 12 SD channels per TP, Dish will be able to do 16 SD channels per TP. This will free up enough TPs at 110 W that Dish will be able to move a large number of SD channels from 119 W to 110 W. This will allow Dish to use some of the spotbeam capabilities of E-8 at the 119 W slot for HD locals. Dish will be able to put 9 or 10 HD channels per TP on the couple of TPs used for HD now at 110 W with the triple power capability of the E-11 satellite.
The succesful launch of the Ciel-2 satellite in late 2008 will allow Dish to offer an all MPEG-4 service to the western part of the U.S. Dish will have use of all 32 TPs at 129 W and 12 TPs will be used for spotbeams. The rest will be high powered CONUS TPs. Dish will put the HD locals for some of the smaller cities out west on 148 W and perhaps come out with a modified D1000 dish to get both 129 and 148 W. The E-6 satellite will either help Ciel-2 at 129 W or perhaps be moved to 148 W to augment/replace E-1 and E-2. If it is used to augment Ciel-2 at 129 W, it can be operated in double power mode on 16 TPs.
Notice that I haven't mentioned the 86.5 W slot. Dish will eventually either abandon it or perhaps use it for a Mexican service because of the interference problems with the two Canadian DBS slots at 82 and 91 W. Dish instead will develop its reverse DBS slots in 2009.