It doesn't sound at all like good news to me. At the happiest, it would seem to add days to the deployment of new HD channels.
Looking at it from the glass half empty side, it might appear that D12 is unable to meet its spotbeam demands (replacing D10 and then some) and they're going to have to figure out some way to use them both. Then again, they may just be trying to verify that D10 can be a backup for D12.
[strike]I would imagine that this process would be complicated and DIRECTV will need to move D10 to a testing slot after everything there has been moved to D12.[/strike] In the interim, it would seem that they have limited new bandwidth at best.
You really should stop posting in the Directv forums. Your posts are virtually all negative ones.