Q: Do we have plans to increase the number of stable slots available to hunters?
A:Obviously we increased it a lot in Wrath of the Lich King. We want to try and keep the pet as some kind of decision - they aren't supposed to be like mounts or titles where you just collect as many as you want. We expanded the size so that players could have say a Tenacity pet for soloing and a Ferocity pet for raiding, but we don't want every hunter to have every family available here. Now one potential problem are the Spirit Beasts, which are collected by hunters and not trivial to replace. We have also discussed expanding the Spirit Beast concept to have rare skins of other pet families (that otherwise don't convey a combat bonus). If we do that, we'd probably have to expand the stable slots.
We've also considered a model where the hunter doesn't even need a stable and can work more like a warlock where they can just summon their pets whenever they want - with the remote stable ability from the dual-spec feature, we're pretty close to that already. If we went this route then maybe the stable could just become pet storage in the same way your bank has all those Invader's Scourgestones and Zul'Gurub bijous that you don't use often but can't bear to part with.
That's all we can see that's changed with the Q&A.