So i was browsing the dungeon journal the other day and when going through the loot from MoP dungeons i noticed that Siege of niuzao temple and gates of the setting sun instances say that they are only available in HC mode. Is this true?
Yes you have 4 leveling up dungeons, the rest are on HC. The reason for this was it seemed pointless to have normal mode max level dungeons. So what they did was just make extra dungeons for HC mode across the board, for a total of 9.