I have to say, I really like mythic dungeons. They feel like they actually take a modicum of coordination and have decent rewards, I got 705 warforged chest out of one. If they actually had real itemization and stuff, maybe even something akin to the old tier .5 upgrade quests (I know, I know, I dream) in the next expac, I would actually be pretty satisfied with 5 man content. Then again, the closest they have come to the feel of the original dungeons (SM/Strath/Scholo/UBRS/BRD) has been the lich king dungeons. I dunno why, I just really liked them - good story that was relevant to the raid, cool epic weapon quest, good items for the content cycle, some fun bosses.
Also, is there any hint of a 'catch up buff' for the lego again this xpac?