Regarding SoO, for me it would have been quite enough if the build-up to this event actually included reasons for Alliance's subsequent withdrawal from all frontlines.
Like. . . .:
>Farseers warning the High King that attempting to raze both Hordes would weaken the overall strenght of Azeroth-bound races to the point that any upcoming cosmic horror would certainly stand triumphant over the lifeless ball of rock that was once a sprawling planet full of life;
>Commanders becoming aware that Alliance has overestimated its fortitude and heavy losses would make occupation/sacking attempt into a pyrrhic victory;
>Some other long-term planning session within the high command that ended with such a solution; etc
But nooooooooo.... there is so far no reason given and I am worried if it will be given at all.
At the worst possible case Blizzard will have Alliance forces holding the victorious rebels at gunpoint - releasing them only to let them know that they could as well have destroyed them, but they chose not to. I had to stomach BS of this kind with a tale of why the Deathwing has mostly spared StormWind - and I would hate to see the faction I picked as my new allegiance to be cursed with similar BS as well.