"Quick view is an experimental project and is currently enabled for pages from Wikipedia when you search in English on Google.com. We are working to expand this to additional websites," explains Google. There's a form for getting updates "about participating in the mobile quick view field trial". Apparently, Quick View loads pages in less than 100 milliseconds.
I've noticed a Quick View link next to Wikipedia results, but nothing happened when I clicked it. Even the search result link for the Wikipedia page was broken. I've checked the source code of the search results page and the code included an excerpt from the Wikipedia article. It's likely that Google hosts a simplified version of the Wikipedia article and that's the reason why it's supposed to load so fast. Here's Google's version of the Wikipedia page for "salmon" (check the source code).
Google also announced the "expandable sitelinks" feature I've mentioned a few days ago. "Now, there's a faster way to get to the Rotten Tomatoes page with just the info you need most -- just look for a new quick link for 'In Theaters' underneath the main Rotten Tomatoes link when you search on your mobile phone. You'll see these expandable sitelinks appear for many sites to help you get to a specific section quickly."