Even though we haven't heard any 'official announcement' yet, might be just sometime now as they might have been ironing out few things before going out in public.
And as mentioned, maybe the date and venue is one obstacles that they have to settled. The network will have to come out as the best place for this fight is, and then the date itself.. I think money wise and split, verbally they could have talk it down already. And we are going to be privilege to witnessed another great fight if this happens this year.