I personally dont know. But some think today, though I would imagine that there are details to be sorted and that today's announcement will be that the league is moving forward, with a presence in Perth, Adelaide, Melb, NZ, Woll, Gold Coast, Towns and Cairns, and that here will be a TV deal with Fox featuring increased coverage from last season.
However, I think actual announcement about Melbourne team(s) and the specifics of the TV deal will come next week or the week after.
But that's just me attempting to join dots together.