As far as my images and income is concerned this "PP link being broken" is a good thing. I don't want 28c sales when I'm getting $1 to $2 and up DLS for the same images on IS. I'd guess for everyone who gets six times more DLs on ThinkStock, it might be different?
Descriptions: I already have them, accurate, describing what's in the image. They were already searched by Search Engines. Google is not the end of the world and almighty only one that counts. But that's another issue. I wouldn't go back and alter descriptions just because of a beta change and roll-out of some testing.
That, and shopping is not the same as buying. Finding an image on a search, doesn't mean the people are looking to buy it. Just that the words matched. The place for buyers to discover and see our work, should be through the agency search.
Search Engine Alexa Rank* Unique Visitors**
google.com 1 182 M
yahoo.com 4 173 M
bing.com 22 162 M
(ask.com 30 69 M)
Only reason Ask shows as #4 is because they are invasive, attach to your computer, infest and install software. Most people try to avoid them.

Take a look at the top three please, and consider not writing everything as if Google is the only one that matters, has spiders, finds things or registers views.
Link between active iStock images and PPsite images is still broken! On PP I miss 30 % of my images.
First of all they must repair this!
Shameful!