It looks like Microsoft has updated Bing for Windows Phones, though what the update provides isn’t immediately clear. Microsoft’s download site shows the "Date Published" as 7/1/2010. My Bing version went from 5.1.2010.5040 to 5.1.2010.6280.
The last update we saw to Bing was the big one back in May that gave us turn-by-turn navigation with voice prompts. Grab the download from Microsoft, and let us know if you see anything new and improved.
Thanks to Muirwoody in the WMExperts forums for getting us looking.