I've also not read the final version, but I read the draft. As far as I can tell it does not substitute these standards, but references them and raises the minimum performance requirements.

For example, you still do the energy simulation measured against a baseline building as per 90.1 appendix G, but now the minimum performance improvement must be 30% (cost based).

Another example is that some of the tables for insulation have been corrected or may have raised the minimum insulation requirements.

The standard aims to address other aspects like water usage previously not covered in other standards in this way.

Future versions of LEED may reference parts of this standard, but as far as I know this is only forseen to happen every 3-4 years, by which time the next ashrae standards has also been released, e.g. 90.1-2010.