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"Today [12-08-11] we’re expanding our content offering with the introduction of Google Currents, a new [mixed-mobile] application..." [googlemobile.blogspot.com...]
Aside: I also wonder what happened to "Googlebot-Mobile" that "crawls pages for our mobile index"? (Source: GWT/Site config/Crawler access/Test robots.txt) At least that bot reads and heeds robots.txt. Whereas, even if it turns out to be Google Currents-related, GoogleProducer does neither.
"From leading publications, to blogs you follow, you can browse, read, and share favorite content, presented in a swipable magazine format." [google.com...]
Might you be able to test a snippet citing/over-quoting your site that's on someone else's site, please?
So it appears this Producer bot is making snapshots, among other things.
Do the snapshots resemble Google Web Preview's?