DA2 did shift to XBox as lead platform, but more from the "it's much easier to take that and adapt it for PC than it is to take PC DAO and try to shoehorn it onto the consoles."
The DA2XP actually shifted the lead platform to PS3, because we still ran into "It's a pain to move from the 360 to the PS3...."
For DAI, I'm not sure what would really be classified as "lead platform" but for all intents and purposes at this juncture, nearly 100% of the development and playing happens on the PC, though with a controller (only very basic keyboard/mouse functionality exists at this time). Due to a variety of performance reasons and so forth with ramping up on Frostbite, as well as next gen console stuff, we're not really at the point of "make sure it works on all platforms" at this juncture.
Thanks for the clarification Allan