That is indeed for clicks generated by exit traffic. Here is the original announcement by ARS:
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"ARS is proud to announce that we are giving publishers a raise on exit payouts that you won?t find anywhere else. Starting immediately, and without any additional work on your part, you will receive 50% of the revenue collected from outbound clicks sent to advertisers in the search results on For Mature Audiences Only (FMAO). FMAO will be the first exit console that pops after a visitor exits the tour.
After researching the revenue generated for webmasters based on the old exit console chain, we have determined that this change will greatly increase your revenue potential on each click sent to ARS. There are no conversion requirements and you will be paid on all outbound clicks on the search results. Stats for the traffic that is sent to FMAO will be visible in your general stats section. This is just another step in our efforts to maximize the monetization of your traffic. "
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ARS webmasters can check the thread on the message board
here.