XCOM: Enemy Unknown was just announced for iPad and iPhone during a PAX East panel.
"It is a straight port. We have not made any gameplay exceptions," XCOM: Enemy Unknown Lead Designer Jake Solomon told us. "You play the exact same game [as on PC or consoles], it's just now fully playable on an iPhone or an iPad."
Asked about the game's pricing, Solomon wouldn't give specifics, saying, "It's going to be priced appropriately for what it is. It's going to be a premium price point. It is the game. It is the full game."
In case you're looking for a definition of "premium" on iOS, expect to be more than $1 and probably push the limits like The Walking Dead does at $15.
The game should be out by summer. We've been told it will not include the Slingshot pack downloadable content, however the Elite Soldier DLC will be included. Meanwhile, the free Second Wave update has not yet been ruled out.