Blizzard listened to players with this tier of armor, giving a different color for each item level available. The sets also use a hybrid purchase model that combines multiple formats of the recent tiers. The 251 version costs Emblem of Frost (95 for chest/legs/helm, 60 for shoulders/gloves) and is required to upgrade to further versions. The 264 version requires the 251 version of that slot as well as a token from 25-player (and likely 10-player heroic) Icecrown bosses -- the Mark of Sanctification. Finally, the 277 version requires your 264 version of the armor plus a heroic Mark of Sanctification, only found in 25-player heroic Icecrown Citadel.
source worldofraids.com
haven't seen cost of tier armor posted anywhere here yet.
t10 token http://ptr.wowhead.com/?items&filter...46;crs=2;crv=0
heroic t10 token http://ptr.wowhead.com/?items&filter...46;crs=1;crv=0