Actually as far as the product description goes, the default descriptions that merchants had now show under Editorial.   In order for it to show in the Description tab the merchant will have to update it and from what I know some people are facing hundreds of product pages that need updating so it might take a while for all the kinks to be ironed out.

Also some merchants have opted for leaving their pages as they were in html format and those older pages can be accessed in the Editorial tab where you'll see the product as before.

As new products come out I assume the vendors will try to make their layout more user-friendly (within the confines of the site's requirements) as it's in their own iterest to do so :)