We don't know that. They still have the sheer shader count that makes them more effective than the 5870/6970 in mining.

That is of course unless the new shader architecture does not incur significant performance loss in password hashing. Given how the bitcoin fiasco pretty much cleared out the 5k/6k generation of cards ultra fast, they'd have to be stupid to not make their new arch mining-friendly. And since the shaders are now far more powerful each, for all we know they may end up with higher mhash than a 5k/6k with equal shader count.

We will see in a few months.