From the image of the Noble Knights box set released today, you can tell a few things about the new cards (by squinting). Merlin appears to be a Level 3 Dark Spellcaster with three separate effects.
Secondly, I'm a couple of days late on this, but the promos for the DUEA Deluxe Edition have been revealed:
Ultra Rare (both in every set)
Performapal Hip Hippo
Yang Zing Unleashed
Super Rare (3 of 5 in every set)
Superheavy Samurai Soulfire Suit