RED micro-site now out!

But the weapons have the same tradeabillity as faf?

The problem is that you can't ever trade them once you've equipped them, you can't scissor them after equipping, it's just completely untradeable, which isn't the same as the RA or Empress sets.

Katara has boss damage. Does it count for the set too?

Nope, doesn't count towards the set. I also wouldn't count on the Katara still having the boss damage/ignore DEF when gets out of the test server.