Quote Originally Posted by Perrin_Aybarra View Post
U/U will NOT be able to be enhanced.

Here is the rep answer on this. Was posted on the French forum which I translated.

http://forum.square-enix.com/ffxiv/t...l=1#post320140

He also says that NM/Dungeon gears will not become obsolete because crafter gears with materias will be balanced in regards to them.

It wasn't specified if U/U gears can turn into materia, but I'd suspect that yes they can.
That's NM gear, not raid/dungeon gear.