There have been more than a few games that have released with issues enabling AA on ATI hardware (espeically on X2 and crossfire configurations). This is not an unusual issue by any stretch of the imagination.
I will be disappointed if it is not fixed by launch, but I consider it a low priority issue in the grand scheme of things.
Those "issues" are often agreements between nvidia and the dev. However, I would be happy if cryptic could sort that out asap