yes, the old articles with only 15% difference are gone.
i have not removed the thin content pages.
a. links to these pages are set up so google will not follow them. its entirely legitimate to have pages for people and not for search engines. For example, i might have a business in my directory with little or no details. Such a business will still have a detail page accessible by users, so if and when the business owner finds it... they can take control of it and update it. But no point in having this detail page indexed, its got no more content than the stub in the business category pages section.
b. such pages which are linked but a link google can not follow, are also set to no index no follow, so they removed from search engine indexes.
They remain accessible on my site, and i want them to stay that way.
for the reord, i remain completely recovered from Panda.
In my mind its just a content quality threshold filter like all of those that come before it.