according to Bornakk. After the somewhat confusing four modes for the same instance that was introduced in Patch 3.2, which redefined "normal" and "heroic" for 10- and 25-man raids, Blizzard is making it easy for players to toggle hard modes for the bosses in Icecrown. The current plan is to make boss hard mode toggles part of the UI rather than through game mechanics such as in Ulduar. This means that players running Icecrown can switch hard modes on and off for bosses throughout the run. As Bornakk states, players "can switch it back and forth as much as you like. Encounter 1 on hard, 2 on normal, 3 on hard, 4 on normal, etc."
It's also interesting to note that Blizzard plans to scale up the Emblems found in older dungeons to Emblems of Triumph the way Emblems of Conquest are dropped in raids now. Newer, higher version emblems will drop in Icecrown, allowing advanced raiders access to the newest gear. This emblem upgrades will allow players to better catch up on gear and consequently explore Icecrown. Of course, Bornakk reminds everyone of the caveat that "Things can still change."
Patch 3.3 is the last major patch of Wrath of the Lich King. With the new Icecrown Citadel 5-man dungeons and 10/25-man raid arriving soon, patch 3.3 will deal the final blow to the Arthas. WoW.com's Guide to Patch 3.3 will keep you updated with all the latest patch news.