This hoverboard doesn't have any unlockable upgrades.
Queen of Hearts is a limited hoverboard in Subway Surfers. Like any other hoverboard, it protects the player from crashing for 30 seconds. When crashed, the hoverboard will need a few seconds to recharge before it can be used again. It is the special board for . This hoverboard has no special powers as seen in the trailer.
It is a square board with the image of the card 'queen of hearts' with a spray can in the center.
It is a reference to queen of hearts card in the solitaire deck.
On the game, the size of Queen of Hearts board is small, and in the trailer is biggest.