Originally Posted by
Meiffert
Blizzard never said that, you are misinterpreting an old message about flex difficulty. Blizzard said something to the effect of "you can bring your friends, who would have to be benched on normal, to flex".
What they meant was: normal (today's heroic) only supports 10 player (or 25 player) mode. If you have a group of 14 people, 4 of them will have to be benched. Additionally, the normal difficulty (today's hc) is relatively difficult, the new flex is going to be between LFR and normal.
Is today's normal flexible in terms of number of players? Yes, it is.
Is its difficulty between LFR and heroic? Yes, it is.
That's all Blizzard said.