They are not going to give the middle finger to an installed base of 10 million that has a very good chunk located in the West where G-Rank as DLC would be the expectation.Not sure how to vote in the poll. If this is g-rank, it's an expansion, but they usually don't do that as DLC, but as a "new" title with the g-rank built in this time, don't they? That would fall under both expansion and new game. :p
But considering how they gave a few monsters really early and then fuck all after that, going to have to guess they have been extremely hard at work on g-rank because of how well world sold.
As has been said before, the most likely model for G-Rank when it is announced is how Street Fighter V Arcade Edition did it. Full price release at retail containing the original game plus the download code for G-Rank. DLC at a decent price for those who already own the original.