In an interview with MrGM and Scottejay, Kris Zierhut dropped some massive news, regarding how loot will change when Ulduar is released, as well as Heroic Dungeons gaining an additional challenge mode for better rewards.
Interview with Kris Zierhut on MrGM Twitch Page Featuring Scottejay
Loot Changes
When Ulduar releases in Phase 2 of Wrath Classic, loot that drops in 10-man raids from Phase 1 will be replaced with loot that drops from 25-man raids from Phase 1.