My patching on my secondary machine lasted about two and a half hours because of having to restart near the end the first time with the out of memory error.
Not sure how it will raid, by frost mage sub max level is serious lulz now, cast frostbolt then hit lance then you can just walk backwards and keep spamming lance as gcd resets. Unless the first bolt misses things are dieing after getting at most 1 melee swing against you.
Graphics improvements are nice, and should see more when the old world gets even more of an update, but expect to need more power to run it.
Be interesting to play the lock once I figure out talent/glyphs on it, on the lowbie mage I could go through a kill 15 mob quest in a fairly tight area pulling one after another and still be a around 30 something percent mana when done, something not possible before. Wonder how this applies at 80.