The bottom half of
this post has images of the new VoA wing. Going by how this new wing fits into the design, there are likely eventually going the to be three bosses in there, representing 3 Tiers of gear, the same as TBC. I don't know how much of that had already been confirmed officially.
That would mean that either 3.2 gives Tier 9 and Icecrown gear works like Sunwell (non-set upgrades) or that 3.2 sees a troll instance, or something that performs a similar role (an instance with Tier 8 level side-grades for WotLK veterans and quick upgrades for latecomers, with Hard Modes for extras), and Icecrown gives Tier 9. I personally think the latter option is more satisfying.
Which brings me to more idle speculation on the Mystery Raid. Somehow, I still think it's strange that Outland has been utterly abandoned, much more so than Azeroth was in TBC. At the moment, there is absolutely nothing at all there for us to care about, and apart from a DK levelling zone, it appears to be the only truely 'dead' continent. There are still a few possibilities for that place: the other Portals leading to demon worlds, potentially undiscovered 'shards' of former Draenor, and the faint possibility of either more Twilight dragons or even Deathwing himself.
Other obvious new raid possibilities are the Chamber of Aspects and the Caverns of Time, although it's hard to see why
all the Dragonflight sanctums should have something for us to kill (Blue (anti-magic Jihad), Green (Nightmare) or Bronze (Infinites) are the most likely candidates). There is at the moment no unused entrance at CoT like there was for Old Strat, but of course it remains a possibility. It would indeed be a nice chance to see the Nerubians and Anub'Arak in a more significant light than now.