The PvE item is stronger in PvE instances

One other thing I should mention based on some other comments in here is that, just like today, PvP Power will be active vs players in any context,

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 not just inside PvP instances. So if you're comparing a PvE and PvP piece of the same item level -- for example,

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 a piece of Conquest gear and a piece of Heroic raid gear -- it should work out something like this:

    The PvE item is stronger in PvE instances
    The PvP item is stronger in PvP instances
    The PvE item is slightly stronger vs creatures in the open world
    The PvP item is slightly stronger vs players in the open world

Legendary questline

Ok, in any case, with the Legendary questline in Mists we wanted to have a reward that everyone could follow along with as the expansion progressed, and to create a story and gear-upgrade thread throughout the expansion, ultimately leading to a Legendary item of some kind.

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Also while developing the expansion it was important for us to support this fairly new system called LFR, and so for the Legendary to also be accessible regardless of the raid difficulty you were involved in. Obviously both have been really successful,

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 and we're happy with hitting the goals we set for ourselves.