It depends on how much extra the base costs compared to how much you save from no extra BD pieces. The Avengers Mark VI was $25 less than the regular Mark VI and it was released over a year later. If they wanted to hike up the price they could have, but they didn't. And that figure might be more limited than this one will be. They won't hike the price up simply because it's a movie promo, if it's more expensive it'll be because the extras cost more to produce. From the looks of it, that won't be the case. I'm guessing it'll sit around 249.99 and I would be very surprised if it was more.
I see that people are talking about this in the other Mark VII thread too