The last information I have regarding the channels migrating off 61.5 W (voluntarily) was back in March 2010. It was due to the fact that, at the time, the core and HD programming available on it was simulcast on 72.7 and 129 and this migration would free up bandwidth to offer more programming. I believe that this has actually happened out of sight, out of mind. Going over my master channel list I notice that there seems to be NO core programming on that satellite when available on another. I do see some international channels and the DISH Platinum channels on there, however. My information specifically excludes locals, as there are still locals on that satellite and those, from what I can tell, are not affected by any plans on migration (which is of course subject to change). I think it was part of the push around that time to offer more local DMA's (w/HD or HD potential). In fact here is some "official" information:
"Due to limited satellite resources and the need to launch more Local programming (both HD and SD) and more HD Core programming, it is necessary that we remove the HD Core, Premium, PPVs, and VOD channels off orbital location 61.5°."
To me that means the orbital is getting cleared of "repetitive" programming and that way more new goodies can be on the way. The real push was to get people to have either 72.7 W or 129 W in their array.
I believe that this information is still valid honestly, even with the recent issue at 77 W. Had to edit a bit here, didn't realize how old the OP was! DOH!