Relevant excerpt from the section "Attracting the World’s Best and Brightest":
These proposed regulations include rules authorizing employment for spouses of certain high-skill workers on H-1B visas, as well as enhancing opportunities for outstanding professors and researchers.
'certain' in this context means: those H1B holders who have completed 6 years of the original visa term. They are compelled to either wait and languish in line, or go back home where their spouse can work.
Where do you see that? If that is the case then it helps only those who applied for permanent residency late in their 6 year H1-B term hence they don't have EAD for their spouse through green card application but can extend their H1-B status indefinitely.
Relevant excerpt from the section "Attracting the World’s Best and Brightest": These proposed regulations include rules authorizing employment for spouses of certain high-skill workers on H-1B visas, as well as enhancing opportunities for outstanding professors and researchers.
As to what certain means remains to be seen.