Today I was looking at an area in the Valais that never before had Bing imagery, and I got high resolution images! I zoomed in and out and dragged the map, and it seems that we have total coverage as promised on the Swiss OSMA site:
"Switzerland currently has only partial coverage by Bing aerial imagery (see coverage maphttp://ant.dev.openstreetmap.org/bingimageanalyzer/?lat=46.72618834060803&lon=8.811132812500006&zoom=8). This is slated to improve by the end of 2012, however this may be delayed and medium term we can only expect infrequent updates."
Mohamed Ellozy (RetiredInNH)