According to all the ocg sources right now, there is a new rank 4 xyz monsters wich looks like this:
2 level 4 monsters
1900 atk / 0 def
If the total number of cards your opponent controls and has in their hands is higher than the total number of cards you control and in your hand, you can activate this effect by removing 1 Xyz Material from this card. Destroy all other cards on the field. This effect can only be activated during your Main Phase or your opponent's Battle Phase.
Which means we finally have a black rose xyz monster, even though we can only active his effect if we are losing... pretty good, dont you think?
I really believe this card is going to shape the game. From now on, field presence is too dangerous, while card advantage (in hand) and draw power means everything.
Also, maybe this cards could work in Crystal Beast because they never actually loss a monsters if it goes destroy.... time to testing I guess.
P.D: Did you realize this card don't have the "once per turn" restriction and is also light??