If there is one thing that'll NEVER change in WoW, it's the feud between both factions (lorewise). Even Ion stated in Blizzcon that the faction vs faction dynamic is a staple of WoW and will never go away.
However, right now, the Horde and Alliance leadership are pretty much all sucking each other off in a big love orgy after they defeated Sylvannas. Thrall and Jaina are over there hold hands. Baine and Jaina are over there making out. First Arcanist Thalyssra and Jaina are over there scissoring. Anduin and the charred remains of Saurfang's corpse is over there 69in'.
So what now? There is too much love between the factions. How will they start hating each other again so we can get back to the status quo.