I know this will never happen because it's unlikely Blizzard will give us a 5 spec (although I would just like to change the balance of the druids because they look more like arcane mages with all this astral theme than like druids), but purely in theories. Would you like to see a Druid specialization based on summons similar to Demonologist Warlocks, Beastmaster Hunters, and Unholy DKs? Beasts already belong to the hunters, so the druid could focus on summoning various creatures of nature from the Emerald Dream. Druid's Balance already has treants, they could be given to a summoner druid (like warlock metamorphosis was given to DH). Such a druid could also summon dryads, various Ancients are seen as a warlock could summon an Infernal or a Doomguard (a druid could summon an Ancient of War for melee combat or an Ancient of Wisdom for spells), maybe even a green dragon.
Thoughts?