openlayers/openlayers — pull request #1298 by nydydn (2014-04-07 21:55:46+00:00)
Title: Added metadata for center of the map for bing layer

Here, http://msdn.microsoft.com/en-us/library/ff701716.aspx , you can see metadata can be extracted for a specific position. If you extract it for a specific position you also get the date of the imagery. This date is very important for remote sensing work.
http://msdn.microsoft.com/en-us/library/ff701716.aspx