Nope. That was for AES, but we have disabled it for now....somehow part of our preliminary work was leaked to you-know-who, so we are unsure if we will ever release it.
The feature was basically the possibility of linking multi carts in chain, they could be linked even with a small wifi adapter, making it possible to play multigame using a multicart. The biggest effor though was to convert games, that weren't initally supporting multi-link, so that they will be able to link....
AES is ready to support it, in case we decide to continue with this again.