Plane Sailing
Astral Admin - Mwahahaha!
My expectation is that its got to do with warlord compatibility, and that we'll see more of it in martial power.
I think that it is important that books stand alone, personally. It would be pretty poor if any discussion could only be taken in the light of all the latest books (or even books yet to come!)
It seems to me that they might have originally intended for there to be a little more synergy with the warlord (or situations were it was valid) but it just fell through the cracks a little.
Where is that "Feather me yon oaf" power when we need it, eh?
(although I guess it got re-described as "stir the hornets nest" which IMO is a rather rubbish name in comparison)
Cheers