Anduin survived with broken bones, and can be found hanging out with Wrathion in a very odd sort of budding friendship (Anduin doesn't really feel Wrathion can be trusted, and Wrathion finds Anduin too stubbornly idealistic, but they have no problem chilling together) come 5.2.
While I'll never argue that Garrosh has become evil (my personal beliefs hew closer to that having been foreshadowed with the subtlety of a brick to the head since Wrath), the Horde itself is suffering a massive schism between those orcs and goblins who have bought into Garrosh's rhetoric, and the blood elves, undead, trolls, tauren, and pandaren who are still in the Horde due to Garrosh's KGB-like fear tactics and the threat of invasion by the Horde if they secede.