I don't think there is going to be a "final secret" in terms of the version code like in MK: DA. I think it will be more of the lines of secrets more like past MK games where you unlock new characters, stages that aren't even in Konquest to find, or maybe even big head mode which seems to be popular these days. Overall I think there will far more secrets than any other MK game since it seems like the MK team is going all out and more like MK: DA.