This is a look at the New Rogue Card Ethereal Peddler coming as part of the new adventure One Night in Karazhan.
The Battlecry reads: Reduce the Cost of cards in your hand from other classes by (2). This is a new flavour text we have not seen before and it opens up some interesting synergies and deck possibilities.
Rogue has a number of ways to get their hands on cards from other classes, so reducing the cost by two is a huge mana gain. This is a decent statted card too, 5/6 for 5 mana is above the vanilla line.
I see this being played in some deck-types for sure.