Yeah, Kings is the only unique extended buff we can give. Our "Hand of" buffs are nice, and we'll work them into our rotations, but they can't be relied upon.
Really though, Kings seems to be more of a Prot only talent. I've played around on the beta as all three specs, and there's no reason for ret to get it, and holy might go into the ret tree now, instead of the prot tree - both ret and holy have to "waste" five talent points on that second teir just to get Kings.
Seems a bit to much to ask for now that Prot pallys will be around for a while.