It appears that Web of Science will be offered…

“in conjunction with Google’s Library Links, article-level links to subscription full text [in Google Scholar search results] for patrons affiliated with a participating library”

Which means that…

“Thomson Reuters is pulling its Web of Science content from discovery services such as Summon, EBSCO Discovery Service, and Primo as early as the end of this year [2013].”

Perhaps this is partly a logical market recognition of the superiority of Google and Google Scholar over web-scale discovery services? That’s what I hear in reviews and tests. [Primo vs. Scholar | Primo, Summon, EDS, WorldCat Local vs. Google, Google Scholar]. One of the biggest differences seems to be that web-scale discovery assumes the data it uses is correct, whereas Google’s bots actively check/harvest/discard on a constant basis. I guess the downside of that is that over-zealous bots can occasionally suck dodgy links into the index.

A downside of the Web of Science integration into Scholar may be that university users will more than ever assume that Google Scholar + Google Library Links is all they need, not realising how much it leaves out. For instance, a 2011 study of Scholar by art historians found that Scholar was indexing only half of the DOAJ’s 30 art history titles. Adding WoS to Google Scholar doesn’t seem likely to cure that problem.