As you know, WoD will (re)introduce the normal and heroic difficulties
for 5man's at max level, which is already a very nice change in my
opinion.


There are players who have been playing WoW for a very long time,
they’re extremely skilled and will only be satisfied with the highest
level of difficulty that we throw at them, that’s “perfect
entertainment” for this type of players.


We also know that not everyone can raid in very high difficulty
environments due to its big time commitment. Sometimes life changes, and
suddenly instead of 3-4 hours every 2 days, some of these players will
only have 1 or 2 hours, and that makes shorter/smaller instances with
the same difficulty level as “mythic” an extremely appealing concept.


Challenge modes will probably be interesting for some of these players,
but we also know that when people talk about TBC heroic 5man difficulty
levels, they’re not talking about mindless zerg/rush timed runs. They’re
talking about planning, strategy, CC, improvisation, randomness and
sheer insane mobs/bosses power, but the “timed” part is still an
important concept in game design to keep everyone on their toes.


We know all that, and we’re doing our very best to provide the most diverse content we can for the next expansion.