If you were in HM-CoE (killing Drinal 4, Amalgamon, Bastion the Immovable) chances are you were also contesting Avatars as there was a max of two or three guilds per server to bid against. Those players moved from CoE-HM to ToV-EM (Accursed Sanctum and Vulakaers/Temple-Heroic). They barely stopped in anything below Temple-Heroic.
If you were in middle Hard Mode, such as killing Ancient Sentinel and Baelon of Thule, you went to High Keep zones and Ishraktum (Stasis and Sactum).
If you were in EM-CoE yes, you went to beginner Heroics (Nexus and Hive) off the start of the expansion. I would hope that those who have cleared Guardian's Edifice (Zlandicar) can jump into Mid-Late Heroics and those who are in Deathtoll and Dreadscales gear can jump to EM-Raiding. It's hard given we have another Level Increase. Which means chances are, we are going to replace MOST gear with Heroics.
This is what happened in Sentinels Fate going from The Shadow Odyssey (Level 80 to 90) and going from Echoes of Faydwer to Rise of Kunark (70 to 80). This time were going from 95 to 100.