Well, nobody can really predict that. If you're in the US, the price is a pretty standard one for games and likely to remain constant. But if you're concerned about it, I would hold off until release.
If you're not in the US, its subject to the currency market and who knows what will happen. 
(At some point after release there will be a sale price. For games, there always is. But that may very well take months before it happens. I ordered my copy months ago and have already paid, so I wasn't too worried about it.)