Bing Maps imagery hits the web with more than 274,000 square kilometers of update in Dec. “Microsoft added / updated 27 counties across Texas, Pennsylvania, Michigan, New Jersey, Virginia, South Carolina, Illinois, Washington D.C. and Oklahoma with fresh new Bird’s Eye photos (33,520 sq. km.). 151 cities across Russia, Poland and Turkey were updated with new aerial (ortho) imagery (240,739 sq. km.). And, finally, 1.1 TB of new Streetside imagery was added”. You can see the finer details on Bing Maps World Tour Applicatio.
Also, got questions about the API, SourceTypes, working with PHP? The answers to these and other Bing developer "frequently asked questions" now are available in Bing Developer FAQs (pdf). These’re same FAQs that’ve always been available in Bing Toolbox support center.