In Discord Bookerman shared NFT levelling will be coming very soon! This was actually already expected with the new UI already having preperations for this so I would assume the front-end was already ready to impelement this but the back-end would need the feature to make it go live.
This also makes me thing the full game release must be very close, since after levelling NFT's all we need is the battling to have atleast a functional game I would think. Oh and the reward system ofcourse, but to be honest to make it playable you don't need the rewards just yet I would say.
So people can prepare and test features before rewards are given out.
The official post about the NFT levelling of WOO, this post shows the requirements for the card to level them to a certain level:
@wrestorgonline/nft-leveling-coming-to-woo