It's not experience with 360, or experience with 360 and PS3, it's experience with 360 or PS3. To me, it seems more like they're seeking someone with experience with the HD system. Besides, they already have a team of 360 capable people.
That said, I'm afraid they're probably going to release a 360 version as well. Why afraid, you might ask. Because of FFXIII, I would answer. If not for the disappointment that was FFXIII, I wouldn't really care that much.







