I’m quite sure it was Heroic for 49,99 and Epic for 79,99 for Wrath too. So it doesn’t seem they bumped up the price just kept it as is.
Edit: Just found a copy of the pic, same Epic price.
Included free with sub but yea, extra’s are not.
Cataclysm Heroic pack is however 29.99
Edit2:
Reminder: No extra purchase necessary for Cataclysm, it comes free with gametime.