The WMAP survey has been updated to use the 7 year integrated datasets from the HEASARC/Lambda archive. Previously we had been using the 5 year data. While there are small changes in the pixel values the underlying organization of the surveys is unchanged. All six WMAP surveys (5 colors and the galaxy subtracted image) have been updated.
If you would like to use the older 5 year datasets within SkyView please let us know.