They are not loaded yet. It could be IB is either waiting closer to the time to make sure they are able to operate it or they will not load it at all and just replace it on the 346 flight randomly. It depends if they want to do what AF did with the A380 LHR-CDG and get PR out of it but that backfired when they subbed it for an A320 and people were dissapointed and generated bad PR.