its not an attunement, since as i understand it. you find the epic key and then your allowed to do 1 run for bonus gold/coins and stuff.
attunement would mean you can do it forever agian without requiring a new key.
Are you talking about a key for the loot-pinata scenario? Then it's not an attunement, you need to get new key each time you want to do the scenario.
Other solo scenarios are there as a story mechanic (like ToR character specific quests), usually a culmination or a state of a chain.
Originally Posted by Archaeon
In tbc everyone wished they were playing vanilla. In cataclysm everyone will wish they were playing wotlk.