It turns out that Microsoft had bigger plans for Foursquare than just search and maps for Bing. The check-in service is now accessible by Redmond's digital assistant, Cortana, as spotted on Reddit by Neowin. The addition apparently makes for customizable, local recommendations based on your whereabouts, and presumably, your account history too. As Winbeta notes, because the Cortana updates take place on Microsoft's servers, you won't need to download a software patch to take advantage of them either. Whether the blue helper will get to love bees, though, is up to her creators.
Update: Microsoft's Bing Blog has confirmed the change and revealed how to turn it on: "pull up Cortana's notebook go to Interests, look for "best nearby" and then toggle to ON."