The latest patch 3.3 build on the PTR has yielded tier 10 purchasing information. When players were purchasing tier 9, they had to to use badges to pick up the item level 232 iterations. But to get the next rank up, they needed badges and a token. When purchasing tier 8, all you needed was a class specific token which dropped from different bosses.
That will not be the case here. Tier 10 purchasing has been streamlined further, and I think this is the best solution as it contains elements of both tier 8 and tier 9 models.
Now when you want to buy tier 10, you have to use Emblems of Frost to purchase the item level 251 variants. This is the lowest version of tier 10 you can get. In order to get the next level which is item level 264, you'll need to get a class specific token which presumably drops from Icecrown Citadel on 25. It could drop from Icecrown Citadel 10 after taking down Arthas or doing some heroic versions of bosses. We have no idea yet.